What is the value of x in the equation

8(x - 3) - 4x = 20?

A
x=−11
B
x=11
C
x=1

D
x=−1

Answer:

is that geometry

Step-by-step explanation:

The size of the letters appear on the retina is 0.00289 cm

Given data:

To determine the size of the letters on the retina, use the concept of angular size and the relationship between object size, distance, and angular size.

Angular size is the measure of the angle subtended by an object as seen from a particular point, in this case, the eye.

Angular size = Object size / Distance

Object size = 1.0 cm

Distance = 6 meters

Angular size = 1.0 cm / 6 meters

To convert the distance to centimeters, multiply by 100:

Angular size = 1.0 cm / (6 meters * 100 cm/meter)

Angular size = 1.0 cm / 600 cm

Angular size = 0.0017 radians

The angular size of the letters is 0.0017 radians.

Now, to determine the size of the letters on the retina, calculate the linear size on the retina using the angular size and the distance from the lens to the retina.

Linear size on retina = Angular size * Distance from lens to retina

Angular size = 0.0017 radians

Distance from lens to retina = 1.7 cm

Linear size on retina = 0.0017 radians * 1.7 cm

Linear size on retina ≈ 0.00289 cm

Hence, the letters appear to be approximately 0.00289 cm in size on the retina.

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△X'Y'Z' is transformed form △XYZ. If △XYZ rotated 90 degrees counterclockwise about the origin, then YZ ⊥ Y'Z'. Hence option B is the correct option.

What is transformation?

A point, line, or geometric figure can be transformed in one of four ways, each of which affects the shape and/or location of the object. Pre-Image refers to the object's initial shape, and Image, after transformation, refers to the object's ultimate shape and location.

Given that,

△XYZ is rotated 90 degrees counterclockwise about the origin to form △X'Y'Z'.

Each side of △XYZ is rotated 90 degrees counterclockwise.

Then the angle between corresponding sides of △XYZ and △X'Y'Z' are 90 degrees.

Therefore

XY⊥X'Y'

YZ ⊥Y'Z'

ZX ⊥ Z'X'.

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Answer: d.) 6

Step-by-step explanation:

Since Chris runs 1. 2 as fast as his usual running speed, he runs at 5 km/h, and so will take 6 hours to complete the 30 km run. Since Pat runs at 11. 2 times her usual speed.

Step-by-step explanation:

we need to bring them to the same denominator. in this case : 10

so, 1/10 of everything are red.

1/5 = 2/2 × 1/5 = 2/10 of everything are blue.

so, we now just add these two :

1/10 + 2/10 = 3/10

so, 3/10 are red and blue (rather red or blue, because none are red and blue)..

Following is the geometric progression of Nelson's debt after each month: (E) 950,967.1, 984.51, 1002.23, 1020.27

A geometric progression sometimes referred to as a geometric sequence in mathematics, is a series of non-zero numbers where each term following the first is obtained by multiplying the preceding one by a constant, non-zero value known as the common ratio.

So, in this issue, the interest rate is as follows: 1.8%.

The debt will therefore be equal to the debt from the previous month multiplied by 100 + 1.8 = 101.8% = 1.018 each month, and the common ratio is as follows: 1.018.

In light of this, the terms of the series are as follows:

2nd term: 950 x 1.018 = $967.1

3rd term: 967.1 x 1.018 = $984.51

4th term: 984.51 x 1.018 = $1002.23

5th term: 1002.23 x 1.018 = $1020.27

Therefore, the following is the geometric progression of Nelson's debt after each month: (E) 950,967.1, 984.51, 1002.23, 1020.27

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Complete question:
Many credit card companies chard a compound interest rate of 1.8% per month Nelson owes 950 on a credit card. If he makes no purchases or payments he will go deeper and deeper into debt.

It explains that people don't want to donate their organs in opt out  because the probability of non donation public are greater.

As we know people who wants to donates their is organs opt out are approximately around 15 %

And we also know that people who don't want to donate their organs are approx. 90 %

In countries such as Australia, laws make organ donation the default option at the time of death, and so people must explicitly “opt out” of organ donation. In these so-called opt-out countries, more than 90% of people register to donate their organs.

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Answer:

Interest rate = 7 percent

Step-by-step explanation:

i = prt

r = [tex] \frac{i}{pt} [/tex]

r = [tex] \frac{1400}{20000 \times 1} [/tex]

r = 0.07

0.07 x 100 = 7

Answer:

16/41 or 39%

Step-by-step explanation:

add both boys and girls and divide boys by that number

The equation for the line connecting the two points is as follows y = 2x + x.

A mathematical statement known as an equation is comprised of two expressions joined together by the equal sign. A formula would be 3x - 5 = 16, for instance. When this equation is solved, we discover that the value of the variable x is 7.

Equation of a line:

y = mx +b

Where;

m = slope

b = y-intercept

You are given the y-intercept from the point (0,2). When x = 0, y = 1

You can then see from the Eq: y = mx + b  

that b = 1

By dividing the change in y by the change in x, or "rise over run," one may get the slope, m.

m = (y1-y2)/(x1-x2)

One of the points is (x1, y1) and the other (x2, y2)

m = (1-(2)) / (0 -(2))

m = (-1)/(-2) = 1/2

The equation for the line connecting the two points is as follows:

y = 2x + x.

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The probability distribution that she or he is on duty on Saturday or Sunday will be 0.7

What is probability distribution ?

A frequency distribution that has been idealised is a probability distribution.

An individual sample or dataset is described by its frequency distribution. It's the number of times in the dataset that each potential value of a variable appears.

The probability of occurrence of a value determines how frequently it appears in a sample. Probability is a value between 0 and 1 that indicates the likelihood that something will happen:

A value will occur more frequently in a sample the higher its likelihood.

The probability of a value is more particularly the relative frequency in an indefinitely large sample.

Probability distributions are theoretical since it is not feasible to obtain infinitely large samples in practise.

Let the people work on Sunday = sun = 4

Let the people work on Saturday = sat = 3

total no. of doctors are 10

so the probability distribution of people work on either Sunday or Saturday will be :

= Sun + sat / total no of doctors

= 3+4/10

=0.7

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The number of subscribers in 2008 will be 110845988.

From the information, in 1985, there were 285 cell phone subscribers in the small town of glenwood. the number of subscribers increased by 75% per year after 1985.

It should be noted that the number of years between 1985 and 2008 will be:

= 2008 - 1985

= 23 years.

Therefore, the number of subscriber in 2008 will be:

= 285 × (1 + 75%)^23

= 285 × 1.75^23

= 285 × 388933.29

= 110845988

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Answer:

12

Step-by-step explanation:

The kind of sequence shown 2, -1, -4, -7, -10, is definitely an arithmetic sequence.

In mathematics, a sequence is a collection of numbers or items that have been organised in a certain order in accordance with a set of rules. These sequences, which might be endless or finite, are useful for simulating a variety of real-world processes. In addition to its practical uses, sequences are an essential mathematical notion that allows us to analyse patterns and relationships between numbers. We may edit and examine sequences to better understand their characteristics and behaviour by applying mathematical operations. Sequences are frequently used to investigate patterns and relationships between numbers, as well as to solve problems in a variety of mathematical disciplines such as algebra, calculus, and geometry. Arithmetic sequences, geometric sequences, recursive sequence are a few examples of frequent sequence types.

How to solve?

In an arithmetic sequence, the difference between any two consecutive terms is constant.

In the given sequence, the difference between any two consecutive terms is -3. i.e.,

d = -10 - (-7) = -7 -(-4) = -4 - (-1) = -1 - (2) = -3

Therefore, the sequence is an arithmetic sequence.

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Geometry is a topic that deals with shapes, lines and angles. The explanation below is required to show the reasons for the statements are given below:

A triangle has three straight sides and three internal angles. The sum of the internal angles of a triangle is [tex]180^{o}[/tex]. Triangles can generally be classifies with respect to the size of angles, or according to the length of sides. Some common types are; right angles, obtuse angled, acute angle, isosceles, equilateral and scalene.

A right angled triangle is a type which has two of its sides at [tex]90^{o}[/tex] to each other.

Therefore, the required statements and reasons to prove that <JLK ≅ <LJM are:

                 STATEMENT                                         REASON

1. ΔJKL and ΔLMJ are right triangles                  Given

2. JK ≅ LM                                                             Hypotenuse-Leg (HL)

3. Jl ≅ LJ                                                                Reflexive property

4. ΔJKL ≅ ΔLMJ                                                    CPCTC

5. <JLK ≅ <LJM                                                     Symmetric property

Thus,  <JLK ≅ <LJM

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Answer: -2.2y - 1.8

Step-by-step explanation:

Combine like terms

1.2y+(-3.4y)

4.5+(-6.3)

-2.2y - 1.8

Answer: A

Step-by-step explanation: To solve this problem, we can set up a system of equations to represent the information given in the problem. Let x represent the cost of a plate of spring rolls, y represent the cost of a plate of chicken tenders, and z represent the cost of a plate of pretzel dippers.

The first group spent $23 on 2 plates of chicken tenders and 1 plate of pretzel dippers, so the equation for this group is:

2y + z = $23

The second group spent $30.75 to buy 3 plates of spring rolls and 1 plate of chicken tenders, so the equation for this group is:

3x + y = $30.75

The third group spent $22.25 on one of each appetizer, so the equation for this group is:

x + y + z = $22.25

Now that we have three equations, we can use algebraic techniques to solve for the value of x, which represents the cost of a plate of spring rolls.

First, we can solve the second equation for y:

y = $30.75 - 3x

Substituting this expression for y into the first equation, we get:

2($30.75 - 3x) + z = $23

Solving for x, we find that x = $7.75.

Therefore, the cost of a plate of spring rolls is $7.75, so the answer is A.

The expression for 60 decreased by twice Jenny's score 60 - 2x.

Expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both. Addition, subtraction, multiplication, and division are all possible mathematical operations. As an illustration, the expression x + y has the terms x and y with an addition operator between them.

Let Jenny's score be x.

Twice Jenny's score will be 2x.

Therefore, the expression will be:

= 60 - 2x

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Answer:

f = 3

g = -1

h = 6

r = 18

Step-by-step explanation:

Box 1

f(x) = [tex]2x^{4}[/tex]-[tex]12x^{3}[/tex]+[tex]16x^{2}[/tex]+4x+15 with x = 3

f(3) = [tex]2(3^{4)}[/tex] - [tex]12(3^{3} )[/tex] + [tex]16(3^{2})[/tex]+ 4(3) + 15

Reorder

Evaluate

Multiply

3f = 2 x 81 - 12 + 27 +16 x 9 + 12 +15

3f = 162 - 324 + 144 + 12 + 15

3f =  9

3  ÷  3

f = 3

Box 1

g(x) = [tex]3x^{3}[/tex] - [tex]16x^{2}[/tex] - 7x - 36 with x = 6

g(6) = [tex]3(6^{3} )[/tex] - [tex]16(6^{2})[/tex] - 7(6) - 36

g6 = 3 x 216 - 576 - 42 - 36

g6 = -6

6   ÷ 6

g = -1

Box 2

h(x) = [tex]5x^{3}[/tex] - [tex]2x^{2}[/tex] - 3 with x = -1

h(-1) = [tex]5(-1^{3} )[/tex] - [tex]2(-1^{2})[/tex] -3

h-1 = -5 + 2 -3

h-1 = -6

-1    ÷  - 1

h = -6

Box 2

r(x) = [tex]4x^{4}[/tex] - [tex]9x^{2}[/tex] + 5x - 2 with x = 2

r(2) = [tex]4(2^{4} )[/tex] - [tex]9(2^{2} )[/tex] + 5(2) - 2

r2 = 64 - 36 + 10 - 2

r2 = 36

2   ÷  2

r = 18

The constant of proportionality of y and x in the graph is given as follows:

k = 3/4.

In a proportional relationship, the ratio between the output variable y and the input variable x is constant, and is called constant of proportionality, given as follows:

k = y/x.

A proportional relationship is a special case of a linear function, which has an intercept of zero, as is the case for the graph in this problem.

The marked point on the graph has the coordinates given as follows:

(4,3).

Meaning that the constant of proportionality of y and x in the graph is calculated as follows:

k = y/x = 3/4.

(division of the value of the y-coordinate by the value of the x-coordinate).

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By solving linear inequation, it can be calculated that

x = 60 , y = 70 is one possible solution.

What is linear inequation?

Inequation shows the comparison between two algebraic expressions by connecting the two algebraic expressions by <, >, ≤, ≥

A one degree inequation is known as linear inequation

Let the number of tacos sold be $x and the number of burrito sold be $y

He only has enough supplies to make 130 tacos or burritos.

x + y [tex]\leq[/tex] 130 ... (1)

He sells each taco for $4.25 and each burrito for $8.50.

Isaac must sell a minimum of $850 worth of tacos and burritos each day.

4.25x + 8.5y [tex]\geq[/tex] 850

x + 2y [tex]\geq[/tex] 200 ... (2)

The inequalities has been solved graphically

One possible solution is x = 60, y = 70

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The percent gain in the number of wolves is 90%.

A percentage is a value or ratio that may be stated as a fraction of 100. If we need to calculate a percentage of a number, we should divide it's entirety and then multiply it by 100. The percentage therefore refers to a component per hundred. Per 100 is what the word percent means. It is represented by %.

From the information, in a wildlife park, there were 20 gray wolves. after a few years, there were 38 gray wolves.

The percent gain will be:

= Increase in wolves / Previous number × 100

= (38 - 20) / 20 × 100

= 18/20 × 100

= 90%

Therefore, it should be noted that based on the information illustrated above, the percentage gain will be 90%.

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Equation for each situation are A = 59 -7t and B = 34 -2t and t<5 is the interval of time.

Two or more expressions with an Equal sign is called as Equation.

Snowman A starts at 59 inches and decreases height at 7 inches per hour.

The height can be represented as A = 59 -7t

Snowman B starts at 34 inches and decreases height by 2 inches per hour. That height can be represented by B = 34 -2t

A is taller than B.

A > B

59 -7t > 34 -2t

add 7t-34

25 > 5t

Divide by 5

5 > t

A will be taller than B when t < 5.

Hence,  A = 59 -7t and B = 34 -2t are equation for each situation and t< is the interval.

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Answer:

Step-by-step explanation:    3?    

If a square has an area of 450 square inches then according to Area = 2(length of a side), the length of one side of that square will be 225 inches.

The formula of Area of a Square is ,

area = side × side = side² square units

whereas the perimeter of square is = 4 x side

A square is a quadrilateral with four equal sides and four equal angles that is a regular quadrilateral. The square's angles are at right angles or at 90 degrees.

let the length of a side of a square is x

area of square is = 450 square inches

as area of square is found as

Area = 2(length of a side)

2x = 450 square inches

x =450/2

x=225 inches

so the length of each side of square is 225 inches.

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Answer:

No.

Step-by-step explanation:

No.

In a proportional relationship, every minute has the same charge.

Answer:

sometimes used to distinguish between the measure of the angle

Step-by-step explanation:

Answer:

x = -3

y = -4

Step-by-step explanation:

2x - 5y = 14 ⇒ ( 1 )

y = 3x + 5 ⇒ ( 2 )

First, let us find the value of x.

For that let us use equation ( 1 ) and replace y with (3x + 5 ).

2x - 5y = 14

2x - 5 ( 3x + 5 ) = 14

Solve the brackets.

2x - 15x - 25 = 14

Combine like terms.

-13x - 25 = 14

Add 25 to both sides.

-13x = 14 + 25

- 13x = 39

Divide both sides by -13.

x = -3

Let us find the value of y.

For that, use equation (2) and replace x with (-3).

y = 3x + 5

y = 3 × -3 + 5

y = - 9 + 5

y = -4