innequality of |2x+7|+9 >18.

The given statistic is said to be an "unbiased estimator". In this statistic, the mean is equal to the true value of the estimated parameter.

In a statistic, if the mean is equal to the estimated parameter, then that statistic is said to be an unbiased estimator. It is used to estimate a population parameter.

Consider a statistic.

"A statistic describes a portion of the target population".

"A parameter describes the whole population".

In a statistic, the mean of the sampling distribution is equal to the true value of the estimated parameter.

I.e., μ = E(x)

So, that statistic is said to be an unbiased estimator.

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Answer:

The first one is the answer

Dean will take a total time of 3 hours and 10 minutes to complete the race and will beat his personal best time

What is an Equation?

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the personal best time of Dean be = A

Now , the value of A = 3 hours 14 minutes 45 seconds

And ,

The time taken by Dean to complete 1 km = 9 minutes 30 seconds

Now , the total distance of the race lap = 20 km

So , the equation will be

Total time taken by Dean to complete 20 km race B = 20 x time taken by Dean to complete 1 km

Substituting the values in the equation , we get

Total time taken by Dean to complete 20 km race = 20 x 9 minutes 30 seconds

Total time taken by Dean to complete 20 km race = 20 x 9 minutes + 20 x 30 seconds

Total time taken by Dean to complete 20 km race = 180 minutes + 600 seconds

1 hour = 60 minutes

1 minute = 60 seconds

180 minutes = 3 hours

600 seconds = 10 minutes

So , the equation is

Total time taken by Dean to complete 20 km race B = 3 hours 10 minutes

So , the value of B < value of A

Therefore , the Dean will beat his personal best time and the race is completed in 3 hours 10 minutes

Hence , Dean will take a total time of 3 hours and 10 minutes to complete the race and will beat his personal best time

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The scale factor of triangle PQR to triangle STU is 3/2

Scale factors are used to increase or decrease image. The situation of increment is usually called magnifying.

Taking a point of reference say PR and SU

PR = 8

SU = 12

let the scale factor be r such that

8 * r = 12

r = 12 / 8

r  = 3/2

checking with other sides

PR to UT

6 * 2/3 = 9 correct

QP to TS

10 * 3/2 = 15 correct

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Answer:

It would be most appropriate to use the mode for categorical data, such as favorite ice cream flavor. This is because you can't use mean or median for flavors such as chocolate or vanilla, so mode would make the most sense there.

An apple pie requires 7 apples and an apple tart requires 4 apples

To set up this problem, we can let p represent the number of apples needed for one pie and t represents the number of apples needed for one tart.

We can then set up the following system of equations to represent the information given in the problem:

2p + 6t = 38

2p + 8t = 46

To solve this system, we can subtract the first equation from the second to eliminate the p terms:

2p + 8t - 2p - 6t = 46 - 38

2t = 8

t = 4

Substituting this value back into the first equation, we get:

2p + 6(4) = 38

2p = 14

p = 7

Thus, an apple pie requires 7 apples and an apple tart requires 4 apples.

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The Scooter Company's total profit function is represented by -2x²+250x-2000.

Total profit of a company is the difference between total revenue and total cost.

The profit or gain is equal to the selling price minus the cost price. Loss is equal to the cost price minus the selling price.

Company earns a total revenue that can be determined by the function R(x) = 400x - 2x²

Each scooter cost $150 to produce, and the company has a fixed cost of $2,000.

Variable cost = Cost of each scooter × Number of scooter sold

Total cost = fixed cost + variable cost

= 2000 + (150×x)

Cost, C(x) = 2000 + 150x

Revenue, R(x) = 400x - 2x²

Total profit = Revenue - Cost

= 400x-2x²-(2000 + 150x)

= 400x-2x²-2000-150x

= -2x²+250x-2000

Therefore, the Scooter Company's total profit function is represented by -2x²+250x-2000.

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The system of equations to model is s=220 and a=241 when 461 tickets for a school performance were sold. Adult tickets are $4 and cost $3 for students.

Given that,

461 tickets for a school performance were sold. Adult tickets are $4 and cost $3 for students. Sales of tickets totaled $1624.

We have to find the system of equations to model.

We know that,

We get,

a + s = 461

s = 461 -a

The student tickets sold = s × 3   = 3 × (461-a)

The adult tix sold =  4 a              

Summed they total 1624

We get system of equations as

s = 461-a

3 (461-a) + 4a = 1624

1383 -3a +4a = 1624

a = 241      

Then  

s = 461 -a = 220

Therefore, The system of equations to model is s=220 and a=241 when 461 tickets for a school performance were sold. Adult tickets are $4 and cost $3 for students.

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The triangles ABC and CDA are congruent by SAS criteria.

Two triangles are said to be congruent when all of their corresponding sides and angles are equal. For this relation between two triangles, there are many criteria such as SSS, SAS, ASA and RHS.

Given that,

In quadrilateral ABCD, AD = BC and AD ║BC.

Now, the given relation ΔABC ≅ ΔCDA can be proved as follows,

In ΔABC and ΔCDA, it is found as,

AC = AC             (Common sides)

AD = BC              (Given data)

And, ∠ACB = ∠DAC (Interior angles between parallel lines AD and BC)

Thus, ΔABC ≅ ΔCDA by SAS congruence criteria.

Hence, the given relation ΔABC ≅ ΔCDA is proved by SAS criteria.

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We can expand the given expression:

(x + 4)²*(x - 2)

To get the equivalent one:

x³ + 6x² - 32

Here we want to expand the given expression, which is:

(x + 4)²*(x - 2)

First remember the rule:

(a + b)² = a² + 2ab + b²

So we can rewrite the first factor as:

(x + 4)² = x² + 2*4*x + 4²

= x² + 8x + 16

Replacing that in our expression we get:

(x² + 8x + 16)*(x - 2)

Now we can expand that to get:

x²*x + x²*(-2) + (8x)*x + 8x*(-2) + 16*x + 16*(-2)

= x³ - 2x² + 8x² - 16x + 16x - 32

= x³ + 6x² - 32

That is the expression expanded.

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Given that he is running on a treadmill at a pace of 7.2 miles per hour, the necessary expression will be y=7.2x.

Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation. An expression's structure is as follows: (Number/variable, Math Operator, Number/variable) is an expression. An expression in mathematics is made up of numbers, variables, and functions (such as addition, subtraction, multiplication or division etc.) You can think of expressions as being comparable to phrases.

Here,

Speed of him=7.2 miles/hour

Let y be the total distance and x be the number of hours,

speed=distance/time

7.2=y/x

y=7.2x

The required expression will be y=7.2x as he is running on a treadmill at a speed of 7. 2 miles per hour.

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Greta's current age is m + n years.

An algebraic expression in mathematics is an expression that is made up of variables and constants, along with algebraic operations (addition, subtraction, etc.).

In other words, algebraic expressions are combinations of variables, numbers, and at least one arithmetic operation

Therefore, let's convert the word's expression to an algebraic expression.

Greta was m years old n years ago. Her age now is as follows:

n years ago Greta was m years old. This simply means n years ago Greta was m years old. Her current age will be the sum of her current age and the number of years ago.

Therefore,

(m + n) years

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The simplification of the ratio 1320 feet : 1 mile will be 1:4

What is Ratio?

A ratio in mathematics illustrates how many times one number contains another. The term ratio is a straight borrowing from the Latin word ratio. In Latin, ratio could imply everything from "reason" to "calculation" to "proportion," and it was this last meaning that was used to create the mathematical and English ratios.

Given taht we need to simplify the ratio 1320 feet : 1 mile

For simplifying ratios we need to convert the terms in same units

and we know that 1 mile = 5280 feet

So,

1320 feet : 1 mile can be written as 1320 feet : 5280 feet

The simplification wil be 1:4

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[tex]~~~~~~ \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\dotfill &\$120000\\ r=rate\to 11.5\%\to \frac{11.5}{100}\dotfill &0.115\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{per annum, thus once} \end{array}\dotfill &1\\ t=years\dotfill &7 \end{cases}[/tex]

[tex]A=120000\left(1+\frac{0.115}{1}\right)^{1\cdot 7} \implies A \approx 257101.92 \\\\\\ \underset{earned~interest}{\stackrel{257101.92 - 120000}{\text{\LARGE 137101.92}}}\hspace{10em}\underset{adjusted~balance}{\stackrel{257101.92 - 25000}{\text{\LARGE 232101.92}}}[/tex]

The category of the polynomial  2x³ - 5 + 9x² is a trinomial

From the question, we have the following expression that can be used in our computation:

2x^3-5+9x^2

Rewrite this expression properly

So, we have the following representation

2x³ - 5 + 9x²

This expression can be further rewritten as

2x³ + 9x² - 5

The degree of a polynomial is the highest power of the polynomial

In this case, the degree of the above polynomial is 3

As a general rule, a  trinomial is any polynomial that has a degree of 3

Hence, the expression is a trinomial

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Answer:

since , 9^x / 9^3 = 9^5

and since there is a law for exponents that says if the bases of the exponent are equal and divided by each other we subtract the exponents

, so 9^x-3 = 9^5

then x-3 =5 , therefore the final answer will be X= 8 .

13>10 is the answer on the number line.

Explanation:

x.6 + 4x -1 > 10

6.6 = 4.6 - 1

36 = 24 - 1

36 - 23 = 13>10.

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13>10 is the answer on the number line.

A system of linear equations has a solution, which is the quantity that makes all of the equations true. This is the intersection of the two graphs for two variables and two equations. The two variables in the two equations will have a solution at these coordinates.

When x=6, x will remain 6 regardless of what y is. Therefore, simply draw a vertical straight line through (6, 0), parallel to the y axis, and extend it on both sides. The finished graph is there.

x.6 + 4x -1 > 10

6.6 = 4.6 - 1

36 = 24 - 1

36 - 23 = 13>10.

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Answer:

the daily fee is 37 and the mileage charge is .24 per mile.

Step-by-step explanation:

256 = 450x + 4b

159 = 200x + 3b

Multiple the top equations by -3 all the way through the bottom equations by 4 all the way  through then add the equation together.

-768 = -1350x -12b

636 = 800x + 12b

-132 = -550x  Divide both sides by -550

.24 = x  This is the charge per mile.

Plug in .24 for x into either of the original 2 equations to solve for b which is the daily fee.

256 = 450(.24) = 4b

256 = 108 + 4b  Subtract 108 from both sides

148 = 4b  Divide both sides by 4

37 = b  This is the daily fee.

Answer:

.05 yd

Step-by-step explanation:

5/91.44=.05468066

Therefore the value of x from the given equation comes out to be 13.5

A statement proving the equality of two mathematical expressions is known as an equation. The equal sign (=) is used to represent an equation between two mathematical expressions. Anything that contains the equal sign is an equation, to put it simply. Examples of equations include x=7, 2x+5=7, etc.

Here,

The equation given is 3(x+2)=7x-48

thus we find the value of x from the given equation

=> 3(x+2)=7x-48

=> 3x+6=7x-48

=> 7x-48-3x-6=0

=>  4x-54=0

=> 4x=54

=> x=54/4

=> x=13.5

Therefore the value of x from the given equation comes out to be 13.5

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The total of his sales for that week is $49,500.

Given :

Nate Belloir earns a weekly commission of 2. 5% on sales of $50,000 or less and 3. 0% on sales in excess of $50,000. One week Nate's commission was $2,135.

Let x be the total sales.

2135 = 2.5 % * 50000 + 3 % (x - 50000 )

= 2.5 * 50000 / 100 + 3/100 ( x - 50000 )

1235 = 2.5 * 500 + 0.03x - 0.03 * 50000

1235  = 1250 + 0.03x - 1500

0.03x = 1235 - 1250 + 1500

0.03x = -15 + 1500

0.03x = 1485

multiply by 100 on both sides

0.03x * 100 = 1485 * 100

3x = 148500

x = $49500

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The algebraic expression that can be represented by the statement is  43y + 16

From the question, we have the following statement that can be used in our computation:

16 more than the product of 43 and a number

Represent the variable with y

So, we have the following representation

16 more than the product of 43 and y

Express the product as an actual product

So, we have the following representation

16 more than  43y

more than as used here means addition

So, we have

43y + 16

Hence, the expression is (d) 43y + 16

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Answer: 43y + 16

Step-by-step explanation:

i did the test

Molly would need 43 feet of fencing to fence the triangular area.

What is Pythagorean theorem?

Pythagorean theorem states that the sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse (the side opposite the right angle).

According to the given question:

We can see that the area is in the form of a right-angled triangle. Since only two sides of the triangle is given, we could utilize Pythagoras theorem to our advantage to find out the third side.

In Δ ABC

AB² (base) + AC² (perpendicular) = BC² (hypotenuse)

Substituting the values of AB as 10 feet and BC as 18 feet

AC²= BC²- AB ²

∴AC²= 224  

∴AC= 14.96 cm

Amount of fence required by molly would equal perimeter of the area.

⇒The perimeter of the area would equal AB+BC+AC

⇒Summing up the values of AB, AC and BC

Perimeter= 10+14.96+18= 42.96 feet which is about 43 feet

Hence, Molly would require 43 feet of fencing.

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Answer:

statements 2 and 3 are true

Step-by-step explanation:

using the rule of exponents

[tex]a^{0}[/tex] = 1

then

1 [tex]a^{0}[/tex]≠ a ← lie

2 [tex]x^{0}[/tex] = 1 ← true

3 [tex]5^{0}[/tex] = 1 ← true

Answer:

Make the denominators equal by L.C.M

--> 8/20 + 5/20

--> 13/20