Lines a and b are perpendicular. The equation of line a is y = 1/3x +3. What is the
equation of line b?

The 95% confident that the true population mean is between 220.26 and 247.74 when standard deviation σ= 55.

If the statistical model used to construct the interval is reliable, a 95% confidence interval is a range of values that is calculated from a sample of data and is anticipated to contain the real population parameter with a probability of 0.95. To put it another way, we would anticipate that 95% of the confidence intervals calculated for each sample taken from the same population will contain the true population value. A broader interval will come from a greater confidence level (such as 99%), whereas a narrower gap will result from a lower confidence level (such as 90%).

The 95% confidence interval is determined by the formula:

CI = X ± z(α/2) * (σ/√n)

Now, given α/2 (α/2 = 0.025 for a 95% confidence interval).

Thus,

CI = 234.00 ± 1.96 * (55/√65)

CI = 234.00 ± 13.74

CI = (220.26, 247.74)

Hence, the 95% confident that the true population mean is between 220.26 and 247.74.

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The length of side x is given as follows:

[tex]x = 2\sqrt{7}[/tex]

The three trigonometric ratios are the sine, the cosine and the tangent, and they are defined as follows:

In the context of this problem, we have that the parameters are given as follows:

Hence we apply the sine of 30º to obtain the length x, as follows:

sin(30º) = sqrt(7)/x

[tex]\frac{1}{2} = \frac{\sqrt{7}}{x}[/tex]

[tex]x = 2\sqrt{7}[/tex]

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Answer: 26 child tickets were sold that day.

Step-by-step explanation:

Let's say the number of child tickets sold is "x".

According to the problem, the number of adult tickets sold is four times the number of child tickets sold. So, the number of adult tickets sold would be 4x.

6.10x + 9.90(4x) = 1188.20

6.10x + 39.60x = 1188.20

45.70x = 1188.20

x = 26

To compute the average velocity over each time interval, we use the formula: average velocity = (h(t2) - h(t1))/(t2 - t1), where h(t) is the height function.

Using the given height function, h(t) = 34t - 4.9t^2, we calculate the average velocities:
1. [3, 3.01]:
Average Velocity = (h(3.01) - h(3))/(3.01 - 3) ≈ -17.147 m/s
2. [3, 3.001]:
Average Velocity = (h(3.001) - h(3))/(3.001 - 3) ≈ -17.194 m/s
3. [3, 3.0001]:
Average Velocity = (h(3.0001) - h(3))/(3.0001 - 3) ≈ -17.199 m/s
4. [2.99, 3]:
Average Velocity = (h(3) - h(2.99))/(3 - 2.99) ≈ -17.243 m/s
5. [2.999, 3]:
Average Velocity = (h(3) - h(2.999))/(3 - 2.999) ≈ -17.205 m/s
6. [2.9999, 3]:
Average Velocity = (h(3) - h(2.9999))/(3 - 2.9999) ≈ -17.200 m/s
To estimate the instantaneous velocity at t=3, observe the average velocities as the time intervals approach t=3:
As the intervals get closer to t=3, the average velocities appear to approach -17.2 m/s. Thus, the estimated instantaneous velocity at t=3 is:
V ≈ -17.2 m/s

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Answer:

108 ft ^2

Step-by-step explanation:

12^2 - 6^2 = 108

To find the standard matrix of a linear transformation, we need to apply the transformation to the standard basis vectors of the domain and express the results in terms of the standard basis vectors of the codomain.

In this case, the linear transformation is the projection onto the line y=6x, which means that any vector in ℝ2 will be projected onto the closest point on the line.

The standard basis vectors of ℝ2 are (1,0) and (0,1), so let's apply the transformation to each of these vectors:

- (1,0) will be projected onto the point (x, 6x) that lies on the line y=6x. The closest point on the line to (1,0) is when x=0, so the projection of (1,0) onto the line is (0,0). Therefore, the first column of the standard matrix will be (0,0).
- (0,1) will be projected onto the point (x, 6x) that lies on the line y=6x. The closest point on the line to (0,1) is when x=1/6, so the projection of (0,1) onto the line is (1/6,1). Therefore, the second column of the standard matrix will be (1/6,1).

Putting these columns together, we get the standard matrix of the projection onto the line y=6x:

[0  1/6]
[0   1 ]

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The derivative of f(x) at x = c does not exist.

To find the derivative of f(x) at x = c using the alternative form of the derivative, we first need to calculate the derivative of f(x) with respect to x.

Given that f(x) = x^3 - 2x^2 + 9, we can find the derivative of f(x) using the power rule and the constant multiple rule. The power rule states that the derivative of x^n, where n is a constant, is n*x^(n-1). The constant multiple rule states that the derivative of a constant multiplied by a function is equal to the constant multiplied by the derivative of the function.

Applying the power rule and constant multiple rule to f(x), we get:

f'(x) = 3x^2 - 4x

Now, we can evaluate f'(x) at x = c, which in this case is x = -2:

f'(-2) = 3(-2)^2 - 4(-2)

= 3(4) + 8

= 12 + 8

= 20

So, the derivative of f(x) at x = -2 is 20. However, we are asked to find the derivative at x = c = -2 using the alternative form of the derivative.

The alternative form of the derivative states that the derivative of a function at a specific point is equal to the limit of the difference quotient as x approaches the given point. In other words, the derivative at x = c is equal to the limit of (f(x) - f(c))/(x - c) as x approaches c.

Substituting c = -2 into the alternative form of the derivative, we get:

f'(-2) = lim(x->-2) (f(x) - f(-2))/(x - (-2))

However, if we try to evaluate this limit, we get an indeterminate form of 0/0. This means that the derivative of f(x) at x = -2 does not exist, as the limit of the difference quotient is undefined. Therefore, the main answer is that the derivative of f(x) at x = c does not exist.

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Required function g(h(x)) is 6 x - 9.

A function is a relationship between a set of outputs referred to as the range and a set of  inputs referred to as the domain, with the condition that each input is contain  to exactly one output. An input x corresponding to a function f output, which is represented by f(x).

We can combine two functions so that the outputs of one function become the inputs of the other if we have two functions is known as composite function . A composite function is defined by this action,that the function g f(x) = g(f(x)) is known as a composite function. This is occasionally referred to as a function of a function. g f can also be written as g o f instead.

We have, h(x)=3 x-5 and g(x)=2 x+1.

So, g(h(x)) = g(3 x - 5) = 2(3 x - 5) + 1 = 6 x - 9.

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As the marginal cost and average cost are both equal to $8 at x = 5, we can conclude that the marginal cost and average cost are equal at this production level.

To find the production level at which the average cost is a minimum, we need to first find the average cost function. The average cost function is given by:

[tex]AC(x) = C(x)/x[/tex]

Substituting C(x) from the given equation, we get:

[tex]AC(x) = (x^3 - 10x^2 + 33x)/x[/tex]

Simplifying this, we get:

[tex]AC(x) = x^2 - 10x + 33[/tex]

To find the production level at which the average cost is a minimum, we need to find the value of x that minimizes the average cost function. We can do this by taking the derivative of the average cost function and setting it equal to zero:

[tex]d/dx (x^2 - 10x + 33) = 2x - 10 = 0[/tex]

Solving for x, we get:

x = 5

Therefore, the production level at which the average cost is a minimum is x = 5.

To show that the marginal cost and average cost are equal at this production level, we need to first find the marginal cost function. The marginal cost function is given by the derivative of the cost function:

[tex]MC(x) = d/dx (x^3 - 10x^2 + 33x) = 3x^2 - 20x + 33[/tex]

Substituting x = 5, we get:

[tex]MC(5) = 3(5)^2 - 20(5) + 33 = 8[/tex]

Therefore, the marginal cost at x = 5 is $8.

To find the average cost at x = 5, we can substitute x = 5 into the average cost function:

[tex]AC(5) = 5^2 - 10(5) + 33 = 8[/tex]

Therefore, the average cost at x = 5 is also $8.

Since the marginal cost and average cost are both equal to $8 at x = 5, we can conclude that the marginal cost and average cost are equal at this production level.

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All positive integers n greater than 1. Therefore, we can conclude that n! < n^n for all n > 1

a) The statement P(2) is 2! < 2^2.

b) P(2) is true since 2! = 2 < 4 = 2^2.

c) The inductive hypothesis is to assume that P(k) is true for some positive integer k.

d) In the inductive step, we need to prove that P(k+1) is true, assuming that P(k) is true.

e) To complete the inductive step, we start with the assumption that P(k) is true, which means that k! < k^k. We then need to prove that (k+1)! < (k+1)^(k+1).

(k+1)! = (k+1) * k! < (k+1) * k^k (since k! < k^k by the inductive hypothesis)

< (k+1) * (k+1)^k

= (k+1)^(k+1)

Therefore, we have shown that (k+1)! < (k+1)^(k+1), and thus P(k+1) is true.

f) By completing the basis step and inductive step, we have shown that P(n) is true for all positive integers n greater than 1. Therefore, we can conclude that n! < n^n for all n > 1.

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Answer:

3

Step-by-step explanation:

gd=14cm

dc=17cm

then,

gd-dc

14cm-17cm

0=14cm-17cm

0=-3

0+3

3

Answer:

1. 2(x+3.60) = 19.40

Divide both sides by 2:

x+3.60 = 9.70

Subtract 3.60 from both sides:

x = 6.10

Answer: 6.10

2. 45.93 + 112 + (−61.24)

45.93 + 112 = 157.93

157.93 - 61.24 = 96.69

Answer: 96.69

3. 20x + 2 > −98

Subtract 2 from both sides:

20x > −100

Divide both sides by 20:

x > −5

Answer: x > −5

4. 2/5 (4x - 8)

= 8x/5 - 16/5

Answer: 8x/5 - 16/5

5. On a school field trip, the number of students (y) is always proportional to the number of adults (x). In one group there are 96 students and 8 adults. What is the constant of proportionality between this relationship?

The constant of proportionality is the number that, when multiplied by the number of adults, gives the number of students. In this case, the constant of proportionality is 96/8 = 12.

Answer: 12

The numeric variable equivalent to equivalent to (x > 5) is, !(x < 5). The answer is D.

The original statement is "x > 5". The negation of this statement is "not (x > 5)", which is equivalent to "x <= 5". However, option A is the opposite of the correct answer since it says "x < 5", not "x <= 5". Option B says "not (x >= 5)", which is equivalent to "x < 5", but again, it is not the correct answer since it uses the "not greater than or equal to" symbol.

Option C says "not (x <= 5)", which is equivalent to "x > 5", but this is the opposite of the original statement. Therefore, the correct answer is D. !(x < 5), which is equivalent to "not (x is less than 5)", or "x is greater than or equal to 5". Hence, option D is correct.

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The composite figure has an area of 24 square units.

In this question we find the representation of a composite figure formed by the combination of four figures, a triangle and three rectangles, whose area formulas are listed below:

Rectangle

A = b · h

Triangle

A = 0.5 · b · h

Where:

Now we proceed to determine the area of the composite figure:

A = 2 · 3 + 0.5 · 2 · 1 + 7 · 2 + 1 · 3

A = 6 + 1 + 14 + 3

A = 24

The area of the composite figure is equal to 24 square units.  

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Answer:

0

Step-by-step explanation:

ny^2 + 2y - 4 = 0

ny^2 + 2y = 4

y(ny + 2) = 4

y = 4

ny + 2 = 4

ny = 2, 0 = 2

The only possible solution to make this expression incorrect is if 0 = 2, so n is equal to 0.

The given differential equation y'' + 8y' + 16y = 0 represents a damped spring system with a damping coefficient of 8 and a spring constant of 16.

To describe the spring system represented by the differential equation y'' + 8y' + 16y = 0, we will be using the given terms.

1. Differential equation (DE): The given DE is a second-order linear homogeneous differential equation with constant coefficients. It represents the motion of a damped spring system, where y'' denotes the acceleration, y' denotes the velocity, and y denotes the displacement of the mass.

2. Damping: The term 8y' represents the damping in the spring system. It is proportional to the velocity (y') of the mass, and acts to oppose the motion, thus slowing down the oscillation.

3. Spring constant: The term 16y represents the restoring force exerted by the spring, which is proportional to the displacement (y) of the mass. The spring constant is 16.

4. Natural frequency: The natural frequency of the spring system can be found by considering the undamped case (i.e., without the 8y' term). In this case, the DE becomes y'' + 16y = 0. The natural frequency (ω_n) can be calculated as the square root of the spring constant divided by the mass (ω_n = √(k/m)). We don't have the mass value, so we can only state that ω_n = √(16/m).

5. Damping coefficient: The damping coefficient is the constant proportionality factor for the damping term. In this case, it is 8.

6. Damped frequency: Damped frequency (ω_d) is the frequency of oscillation when damping is present. It can be found using the natural frequency and the damping ratio (ζ). However, we do not have enough information to calculate the damping ratio or the damped frequency in this case.

In summary, the given differential equation y'' + 8y' + 16y = 0 represents a damped spring system with a damping coefficient of 8 and a spring constant of 16. The natural frequency depends on the mass, but the damped frequency cannot be calculated without additional information.

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The value of b is given as follows:

b = 5.

The slope-intercept representation of a linear function is given by the equation presented as follows:

y = mx + b

The coefficients of the function and their meaning are described as follows:

When two lines are parallel, they have the same slope, hence:

4x + 5y = 1

5y = -4x + 1

y = -4x/5 + 1.

Hence:

y = -4x/5 + b.

When x = 4, y = 3, hence the intercept is given as follows:

3 = -16/5 + b

b = 31/5

Hence, in standard format, the equation will be given as follows:

y = -4x/5 + 31/5

4x/5 + y = 31/5

4x + 5y = 31

Meaning that the value of b is of 5.

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By the rank-nullity theorem, we know that for any matrix A, the rank of A plus the dimension of the null space of A is equal to the number of columns of A. If the null space of a 7 times 9 matrix is 3-dimensional, Rank A = 6, Dim Row A = 6, Dim Col A = 6

we know that for any matrix A, the rank of A plus the dimension of the null space of A is equal to the number of columns of A. That is:

Rank A + Dim Null A = # of columns of A

In this case, we are given that the null space of the 7x9 matrix A is 3-dimensional. Therefore, we have:

Rank A + 3 = 9

Solving for Rank A, we get:

Rank A = 6

Now, we also know that the rank of a matrix is equal to the dimension of its row space and the dimension of its column space. That is:

Rank A = Dim Row A = Dim Col A

Therefore, we have:

Rank A = Dim Row A = Dim Col A = 6

So the correct option is: Rank A = 6, Dim Row A = 6, Dim Col A = 6

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The component form of v, we need to determine its x and y components. We can use trigonometry to do this. Therefore, the component form of v is: v = (-7/4, (7/4)√3)

We know that the magnitude of v is 7/2, so we can use this information to find the length of the hypotenuse of the right triangle formed by the x and y components of v. Let h be the hypotenuse:

h = ||v|| = 7/2

Next, we can use the angle θ to determine the ratios of the sides of the right triangle:

cos(θ) = adj/h = x/7/2
sin(θ) = opp/h = y/7/2

where x is the x component of v and y is the y component of v.

Substituting in the given values, we have:

cos(150∘) = x/7/2
sin(150∘) = y/7/2

Simplifying these equations, we get:

x = -7/4
y = (7/4)√3

Therefore, the component form of v is:

v = (-7/4, (7/4)√3)

To sketch v, we can plot the point (-7/4, (7/4)√3) in the Cartesian plane. The x component is negative, so the point will be in the third quadrant. The y component is positive and greater than the x component, so the point will be above the x-axis and closer to the y-axis. The resulting vector should be pointing in the direction of 150∘ from the positive x-axis.

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The balance after 3 years on a Certificate of Deposit with an APR of 2.25% that compounds annually is $2,163.05.

Balance refers to the equality between two expressions or equations, where both sides have the same value. It is often used in solving equations or evaluating algebraic expressions.

A compound refers to a combination of two or more simple mathematical statements or propositions, connected by logical operators such as "and", "or", or "not". It is used in logic and boolean algebra.

To calculate the balance after 3 years on a Certificate of Deposit with an APR of 2.25% that compounds annually, we can use the formula:

A = P(1 + r/n)^{n*t}

Where:

A = the balance after t years,

P = the principal amount invested,

r = the annual interest rate as a decimal,

n = the number of times the interest is compounded per year,

t = the number of years

Plugging in the given values, we get:

P = $2,000r = 0.0225 (2.25% expressed as a decimal)

n = 1 (compounded annually)

t = 3 years,

[tex]A = 2,000(1 + 0.0225/1)^{1*3}[/tex]

[tex]A = 2,000(1 + 0.0225)^3[/tex]

[tex]A = 2,000(1.0225)^3[/tex]

A = $2,163.05 (rounded to the nearest cent)

Therefore, the balance after 3 years on a Certificate of Deposit with an APR of 2.25% that compounds annually is $2,163.05.

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The length of the curve y = x^4 for 0≤ x ≤1 is approximately 1.082.

To find the length of the curve y = x^4 for 0≤ x ≤1, you'll need to use the arc length formula:

Arc length = ∫√(1 + (dy/dx)^2) dx from a to b, where a = 0 and b = 1.

First, find the derivative of y with respect to x:
y = x^4
dy/dx = 4x^3

Now, square the derivative and add 1:
(4x^3)^2 + 1 = 16x^6 + 1

Next, find the square root of the result:
√(16x^6 + 1)

Now, integrate the expression with respect to x from 0 to 1:
∫(√(16x^6 + 1)) dx from 0 to 1

Unfortunately, this integral doesn't have a closed-form solution, so we'll need to use numerical methods, such as Simpson's rule or a numerical integration calculator, to approximate the length.

Using a numerical integration calculator, the length of the curve y = x^4 for 0≤ x ≤1 is approximately 1.082.

Your answer: 1.082

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The length of the curve y = x^4 for 0≤ x ≤1 is approximately 1.082.

To find the length of the curve y = x^4 for 0≤ x ≤1, you'll need to use the arc length formula:

Arc length = ∫√(1 + (dy/dx)^2) dx from a to b, where a = 0 and b = 1.

First, find the derivative of y with respect to x:
y = x^4
dy/dx = 4x^3

Now, square the derivative and add 1:
(4x^3)^2 + 1 = 16x^6 + 1

Next, find the square root of the result:
√(16x^6 + 1)

Now, integrate the expression with respect to x from 0 to 1:
∫(√(16x^6 + 1)) dx from 0 to 1

Unfortunately, this integral doesn't have a closed-form solution, so we'll need to use numerical methods, such as Simpson's rule or a numerical integration calculator, to approximate the length.

Using a numerical integration calculator, the length of the curve y = x^4 for 0≤ x ≤1 is approximately 1.082.

Your answer: 1.082

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The hydrostatic pressure on the bottom of the aquarium is 4015 lb/ft2. The hydrostatic pressure on the bottom of the aquarium is 96360 lb. The hydrostatic pressure on one end of the aquarium is 97440 lb.

(a) The hydrostatic pressure on the bottom of the aquarium can be found using the formula P = ρgh, where P is the pressure, ρ is the density of the fluid, g is the gravitational acceleration, and h is the depth. In this case, ρ = 62.5 lb/ft3, g = 32.2 ft/s2, and h = 2 ft. The pressure is:

P = ρgh = 62.5 lb/ft3 × 32.2 ft/s2 × 2 ft = 4015 lb/ft2

So the hydrostatic pressure on the bottom of the aquarium is 4015 lb/ft2.

(b) The hydrostatic force on the bottom of the aquarium can be found using the formula F = P A, where F is the force, P is the pressure, and A is the area. The area of the bottom of the aquarium is 6 ft × 4 ft = 24 ft2. The force is:

F = P A = 4015 lb/ft2 × 24 ft2 = 96360 lb

So the hydrostatic force on the bottom of the aquarium is 96360 lb.

(c) The hydrostatic force on one end of the aquarium can be found using the formula F = ρgAh, where A is the area of the end, which is 6 ft × 2 ft = 12 ft2. The depth of the end is 4 ft. So the force is:

F = ρgAh = 62.5 lb/ft3 × 32.2 ft/s2 × 12 ft2 × 4 ft = 97440 lb

So the hydrostatic force on one end of the aquarium is 97440 lb.

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The solution of the initial-value problem of x'=[1/2 0; 1 -1/2] x is x(t) = [4/3 * e^(t/2); 5/3 * e^t + 8/3 * e^(t/2)].

To solve the given initial value problem x'=[1/2 0; 1 -1/2] x with x(0)=[4;9], we need to find the solution of the system of differential equations.

The characteristic equation of the matrix [1/2 0; 1 -1/2] is λ^2 - (3/2)λ + (1/4) = 0, which has two distinct roots, λ_1 = 1/2 and λ_2 = 1.

The general solution of the system is x(t) = c_1 * [1; 2] * e^(λ_1t) + c_2 * [0; 1] * e^(λ_2t), where c_1 and c_2 are constants to be determined using the initial condition x(0) = [4; 9].

Substituting the values of λ_1, λ_2, and x(0) in the above equation, we get c_1 = 4/3 and c_2 = 5/3.

Therefore, the solution of the initial-value problem is x(t) = [4/3 * e^(t/2); 5/3 * e^t + 8/3 * e^(t/2)].

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--The given question is incomplete, the complete question is given

" Solve the given initial-value problem x' is matrix of 2x2 form, x' = [1/2  0   1  −1/2] x,  x(0) = [4 9] of 2x1 matrix form. find x(t)"--

The coefficient of x¹⁰ in (1 × x × x² × x³ × …)ⁿ is 1 for n=5 and n=10. For other values of n, the coefficient of x^10 will be 0, as there are no other possible combinations to achieve x¹⁰.

To find the coefficient of x¹⁰ in (1 × x × x² × x³ × …)ⁿ, you need to determine the possible ways to select terms from the sequence (1 × x × x² × x³ × …) such that their product is x¹⁰ and there are n terms.

Let's consider the following possible combinations of terms that can result in x^10:

1. x × x² × x² × x² × x³ (Here, n=5)
2. x² × x² × x² × x² × x² (Here, n=10)

These are the only two combinations that result in x¹⁰, assuming all powers of x are positive. For the first combination, there is only one way to select the terms, so the coefficient is 1. For the second combination, since all terms are the same, there is also only one way to select the terms, so the coefficient is 1.

Therefore, the coefficient of x¹⁰ in (1 × x × x² × x³ × …)ⁿ is 1 for n=5 and n=10. For other values of n, the coefficient of x^10 will be 0, as there are no other possible combinations to achieve x¹⁰.

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The coefficient of x¹⁰ in (1 × x × x² × x³ × …)ⁿ is 1 for n=5 and n=10. For other values of n, the coefficient of x^10 will be 0, as there are no other possible combinations to achieve x¹⁰.

To find the coefficient of x¹⁰ in (1 × x × x² × x³ × …)ⁿ, you need to determine the possible ways to select terms from the sequence (1 × x × x² × x³ × …) such that their product is x¹⁰ and there are n terms.

Let's consider the following possible combinations of terms that can result in x^10:

1. x × x² × x² × x² × x³ (Here, n=5)
2. x² × x² × x² × x² × x² (Here, n=10)

These are the only two combinations that result in x¹⁰, assuming all powers of x are positive. For the first combination, there is only one way to select the terms, so the coefficient is 1. For the second combination, since all terms are the same, there is also only one way to select the terms, so the coefficient is 1.

Therefore, the coefficient of x¹⁰ in (1 × x × x² × x³ × …)ⁿ is 1 for n=5 and n=10. For other values of n, the coefficient of x^10 will be 0, as there are no other possible combinations to achieve x¹⁰.

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Answer:

y = 16

Step-by-step explanation:

You are in putting 2, meaning that x = 2. Plug in the corresponding numbers to the corresponding variables:

[tex]y = 12x - 8\\x = 2\\\\y = 12(2) - 8[/tex]

Remember to follow the order of operations, PEMDAS. PEMDAS stands for:

Parenthesis

Exponents (& Roots)

Multiplications

Divisions

Additions

Subtractions

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First, multiply 12 with 2, then subtract 8:

[tex]y = 12(2) - 8\\y = (12 * 2) - 8\\y = (24) - 8\\y = 16[/tex]

y = 16 is your answer.

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If Z is between -1 and 1, then the percentage is within the 68% range. If Z is between -2 and 2, then the percentage is within the 95% range. If Z is between -3 and 3, then the percentage is within the 99.7% range.

To use the empirical rule to estimate the percentage of cold sufferers who experience symptoms for less than 9.9 days, we first need to know the mean (average) and the standard deviation of the data.

Let's assume that the mean (µ) is X days and the standard deviation (σ) is Y days. The empirical rule states that for a normal distribution:
- Approximately 68% of the data falls within 1 standard deviation (σ) of the mean (µ)
- Approximately 95% of the data falls within 2 standard deviations (σ) of the mean (µ)
- Approximately 99.7% of the data falls within 3 standard deviations (σ) of the mean (µ)

Now, we want to estimate the percentage of cold sufferers who experience symptoms for less than 9.9 days. We need to determine how many standard deviations away 9.9 days is from the mean.

To do this, use the formula:

Z = (Observed Value - Mean) / Standard Deviation
Z = (9.9 - X) / Y

Once you calculate the Z score, refer to the empirical rule:
- If Z is between -1 and 1, then the percentage is within the 68% range.
- If Z is between -2 and 2, then the percentage is within the 95% range.
- If Z is between -3 and 3, then the percentage is within the 99.7% range.

Finally, based on the Z score and the empirical rule, you can estimate the percentage of cold sufferers who experience symptoms for less than 9.9 days.

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The particle is at rest when the velocity is zero.

To find the values of t, you need to calculate the first derivatives of the parametric equations and set them equal to zero.

Main answer: The particle is at rest for t = 0 and t = 2.


1. Calculate the first derivatives of x(t) and y(t):
dx/dt = 3t² - 6t
dy/dt = 6t² - 6t - 12

2. Set the derivatives equal to zero and solve for t:
3t² - 6t = 0
6t² - 6t - 12 = 0

3. Factor the equations:
t(3t - 6) = 0
6(t² - t - 2) = 0

4. Solve for t:
t = 0, (3t - 6) = 0
t² - t - 2 = 0

5. From the first equation, t = 0 or t = 2.
From the second equation, use the quadratic formula:
t = (1 ± √(1 + 8))/2
t ≈ 1.41, -1.41

6. The particle is at rest for t = 0 and t = 2. The other values do not correspond to a stationary point.

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The size of angle MWT is calculated to 1 d.p. to give

37.8 degrees

The size of angle MWT is solved using trigonometry tan

tan (angle MWT) = (distance midpoint of a to edge w) / b

Where distance midpoint of a to edge w is calculated using Pythagoras theorem

(distance midpoint of a to edge w)² = (1/2 a)² + c²

(distance midpoint of a to edge w)² = (1.35)² + 9.2²

distance midpoint of a to edge w = 9.3

tan (angle MWT) = 9.3 / 12

angle MWT = arc tan (9.3/12) = 37.776

angle MWT = 37.8 degrees to 1 d.p.

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Answer: The answer is B, y= 3x+5