Margie’s work for adding linear expressions is shown below. After checking her answer key, she solved it incorrectly.

Given: (-3.78b + 12) - (4.82b - 16)
Step 1: -3.78b + 12 + -4.82b - 16
Step 2: -3.78b + -4.82b + 12 - 16
Step 3: (-3.78b + 4.82b) + (12 - 16)
Step 4: -8.6b + (-4)

Part A: Identify and explain the first step where Margie made an error

Part B: Explain how to correctly write the expression in the fewest terms by correcting the error in Part A.

Answer: (8,-4), (6,-2), (5,-1)

Answer:

Step-by-step explanation:

2038

The monomial in standard form is 6x¹¹y¹⁸.

The given expression is

[tex](-3xy^{2})^{3} .(-\frac{2}{3}x^{2} y^{3} )^{4}[/tex]

We to write the expression as a monomial in standard form

Monomial is an expression having a single term. It can be represented as kxⁿ, where k is any integer often known as the coefficient, x represents the variable/s in the given expression and n denotes the power.

In the expression

[tex](-3xy^{2})^{3} .(-\frac{2}{3}x^{2} y^{3} )^{4}[/tex]

we first need to multiply the powers

using the formula

(mn)ˣ = mˣnˣ

[tex](-3xy^{2})^{3} .(-\frac{2}{3}x^{2} y^{3} )^{4}\\(-3x^3y^{2.3}) .(-\frac{2}{3}x^{2.4} y^{3.4} )\\(-3x^3y^{6}) .(-\frac{2}{3}x^{8} y^{12} )\\[/tex]

Now, we need to multiply both the terms

The following formula is used

xᵃ . xᵇ = xᵃ+ᵇ

[tex](-3x^3y^{6}) .(-\frac{2}{3}x^{8} y^{12} )\\\\-3(-\frac{2}{3})x^{3+8} y^{6+12} \\\\6x^{11}y^{18}[/tex]

Therefore the monomial in standard form is 6x¹¹y¹⁸.

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The missing entries are (a) $686, (b) $635, (c) $1035, (d) $1010, (e) $938.88 and (f) $447.37.

Debit card is a card owned by a person for which the money used for transaction will be withdrawn or added into the account of the holder immediately.

Given is a table showing the transactions of Gino with his debit card.

He has an initial deposit amount of $778.19.

New balance in the account will be the difference of previous balance and the payment amount.

He paid $92.19 for baseball bat.

a = $778.19 - 92.19 = $686

He paid $51.00 for gas.

b = $686 - $51 = $635

He deposited $400.

c = $635 + $400 = $1035

He paid $25 for gas.

d = $1035 - $25 = $1010

He paid $71.12 for dinner at Spooner's on the beach.

e = $1010 - $71.12 = $938.88

He paid $491.51 for the books for all semester.

f = $938.88 - $491.51 = $447.37

Hence the missing entries are found.

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The problems in the test are 16.

In the given case a student missed four problems on a test.

The test happened to be a mathematics test and the student scored a total percentage of 75%.

It is mentioned that every question has of same score values.

To find out how many problems were actually on the test we need to solve the problem by following the steps.  

Let,

Questions not attempted ( x ) = 4

Percentage gained ( y ) = 75%

The percentage lost is 25%

The total questions in the test are;

         → A = (100/25) * 4

            A = 16

Therefore, the questions in the test are 16.

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Answer:

Step-by-step explanation:

Using algebraic identities, we found that for B=2 and B= -2 , the trinomial x² + Bx +1  makes a perfect square.

Algebraic identities are the identities which aids in solving products or powers of algebraic expressions. Most common identities are :

(a+ b)² = a² + 2ab + b²

(a- b)² = a² - 2ab + b²

a² -b² = (a+ b) (a- b), where a and b can be variable or constants or algebraic expressions.

Let the perfect square of the trinomial be (x +a)²

x² + Bx +1 = (x+ a)² = x² + 2xa + a² (using identity (a+ b)² = a² + 2ab + b²)

⇒ x² + Bx +1  = x² + 2xa + a²

⇒ Bx = 2xa , a² =1

⇒B = 2a , a =± 1

if a =1 ⇒ B = 2

If a = -1 , B = -2

For B = 2 , x² + Bx +1  = x² + 2(1)x +1² = (x+1)² ( ∵(a+ b)² = a² + 2ab + b²)

For B = -2 , x² + Bx +1  = x² -2x + (-1)² = x² -2x +1 = ( x-1)²  (∵(a- b)² = a² -2ab  

                                                                                                                 + b²)

Thus, the given trinomial x² + Bx +1  is perfect square when B =2 or -2

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================================================

Work Shown:

[tex](x_1,y_1) = (10,4) \text{ and } (x_2,y_2) = (7,3)\\\\m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}\\\\m = \frac{3 - 4}{7 - 10}\\\\m = \frac{-1}{-3}\\\\m = \frac{1}{3}\\\\[/tex]

-----------------

Extra info:

A slope of 1/3 means "go up 1, then to the right 3"

Think of it like this

slope = rise/run = 1/3

rise = 1 = go up 1

run = 3 = go to the right 3

Answer:

p > -10/3

Step-by-step explanation:

-4<6+3p

-10<3p

p>-10/3

:]

Answer: p > 10/-3

Step-by-step explanation:

1) Remove the whole numbers next to the variable

Add 10 on both sides.

-3p < 10

2) Set x by itself

Divide -3 on both sides. Dividing -3 will flip the operator sign. (Dividing/Multiplying negative number flips the sign)

p > 10/-3

-6x-11=19/+11 <=>

<=> -6x=30/:(-6) <=>

<=> x=-5

Answer:

=(3x - 2y( (4x - 3y)

Step-by-step explanation:

We have,

12x2 – 17xy + 6y2

The coefficient of x2 is 12

The coefficient of x is -17y

Constant term is 6y2

So, we express the middle term -17xy as -9xy – 8xy

12x2 -17xy+ 6y2 = 12x2 – 9xy – 8xy + 6y2

= 3x (4x – 3y) – 2y (4x – 3y)

= (3x – 2y) (4x – 3y)

The shortest side is 22 meters in the mentioned quadrilateral.

Let us assume the length of first side be x. So, the other three sides of length will be (x + 1), (x + 2) and (x + 3). The perimeter is sum of all sides of the quadrilateral.

Keep the values in the formula of perimeter -

94 = x + x + 1 + x + 2 + x + 3

Performing addition on Right Hand Side of the equation

94 = 4x + 6

Shifting 6 to other side of the equation

4x = 94 - 6

Performing subtraction on Right Hand Side of the equation

4x = 88

Shifting 4 to Right Hand Side of the equation

x = 88 ÷ 4

Performing division

x = 22

Thus, the shortest side of quadrilateral is 22 meters long.

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Answer: [tex]\frac{\sqrt{x}^3 }{3}[/tex]

Step-by-step explanation:

Step 1: Insert f(x) in for the x in g(x). This will give you [tex]\sqrt{x^3}[/tex]

Step 2: Insert [tex]\sqrt{x^3}[/tex] into the x in h(x) giving you [tex]\frac{\sqrt{x}^3 }{3}[/tex]

According to a government study among adults the percent of the adults spend more than $2,775 per year on reading and entertainment is

Given data form the question

the mean amount spent per year on reading and entertainment is $1,875

standard deviation of $640

what percent of the adults spend more than $2,775 per year on reading and entertainment

Definition of variables

mean sample, μ = $1,875

standard deviation, σ =  $640

measure X = $2,775

For normal distribution, the z-score of a measure X with mean μ and standard deviation σ  is given by as follows:

Z = ( X - μ ) / σ

Z = (2775 - 1875) / 640

Z = 1.40625 gives p-value of 0.0798250014

This is equivalents to 7.98%

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Answer:

54.4 %

Explanation:

The percent change in net sales can be calculated as:

Where the final number is the net sales in quarter 2 and the initial number is the net sales in quarter 1. Replacing the values by 170 and 110, we get:

Therefore, the answer is:

percent change = 54.5 %

The flat cost of the plan = is $46 per month

Cost per gigabyte = $5 per gigabyte

Number of gigabytes = g

The maximum amount Mei Mei wants to spend on the bill = is $70 per month,

So, for each month,

$46 + $5(g) < $70

⇒ $5(g) < $70 - $46

⇒ $5(g) < $24

⇒ g < $24/$5

⇒ g < 4.8

The number of gigabytes to be used per month should be less than or equal to 4.8.

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Inequality: 5g+46<70
Answer: g<4.8

Step-by-step explanation:

the y-intercept (b) is the easiest :

it is the y-value, when x = 0 : -3

the slope (m) is the ratio (y coordinate difference / x coordinate difference) when going from 1 point to another.

so, we need to identify 2 points in the line.

one we have already with b : (0, -3)

another is the x-axis intercept, which is clearly (4, 0)

the difference is not important, but we need to use the same for both (x and y).

I prefer to go from left to right, so from (0, -3) to (4, 0) :

x changes by +4 (from 0 to 4)

y changes by +3 (from -3 to 0)

the slope is +3/+4 = 3/4

The relationship has no relation to continental drift theory, as it is a relation between distance and time, not distance and elevation.

The continental drift theory states that the world's tectonic plates are in constant motion over time.

This is supported by the fact that some millions of years ago, there was only one continent, named Pangea, and now we have the continents as we know. These continents are also moving a small amount a year.

In this problem, the elevation decreases and the distance increases, however, the continental drift theory should have the distance increasing or decreasing over time, hence the graph relationship has no relation to the continental drift theory.

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Answer:

22 apples

Step-by-step explanation:

33/6=5.5*4=22

Pls give brainliest

Answer:

I believe the answer would be 22 apples

If the number of cups of water w, needed for f cups of flour is described by the equation w = 0.75f, 0.75 represents the number of cups of water needed for one cup of flour

The equation is

w = 0.75f

Where w is the number of cups waters needed for f cups of flour.

Here w is is dependent variable and f is the independent variable

We can see that w is proportional to the f, the 0.75 is the constant.

w = 0.75f

Move the f to left hand side of the equation

w/f = 0.75

Hence, If the number of cups of water w, needed for f cups of flour is described by the equation w = 0.75f, 0.75 represents the number of cups of water needed for one cup of flour

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Answer:

the percentage change is a 60% change.

Step-by-step explanation:

A change from 5 to 2 represents a negative change (decrease) of -60%

Use the formula found below on this webpage to find the percent change by replacing the given values:

Percent change = New - Old

|Old|

× 100%

Percent change = 2 - 5

|5|

× 100% =

-3

5

× 100 = -60% (decrease)

Where: 5 is the old value and 2 is the new value. In this case we have a negative change (decrease) of -60 percent because the new value is smaller than the old value.

Substitution method - the points are (-6, -11/2),(-4,-3), (-8/5,0), (0,2) and (4,7)

what is the substitution method?

To solve many simultaneous linear equations, use the substitution method in algebra. The value of a variable from one equation is substituted in the second equation in this procedure, as the name implies.

we are given the equation,

5x - 4y = -8

case I

when x = -6

5(-6) - 4y  = -8

-30 - 4y = -8

-4y = -8 + 30

-4y = 22

y = -(22/4)

y = -11/2

(x,y) = (-6, -11/2)

case II

when y = -3

5x - 4(-3) = -8

5x + 12 = -8

5x = -8 -12

5x = -20

x = -20/5

x = -4

(x,y) = (-4,-3)

case III

when y = 0

5x - 4y = -8

5x - 4(0) = -8

5x = -8

x = -8/5

(x,y) = (-8/5,0)

case III

when x = 0

5(0) - 4y = -8

0 - 4y = - 8

y= 8/4

y = 2

(x,y) = (0,2)

case IV

when x = 4

5(4) - 4y = -8

20 - 4y = -8

-4y = -8-20

-4y = -28

y = 28/4

y = 7

(x,y) = (4,7)

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Answer:

-1/4

Explanation:

To write the decimal -0.25 as a fraction we need to multiply and divide by 100 as follows:

We multiply by 100 because there are 2 digits after the decimal point.

Then, we need to simplify the fraction, so we can divide the numerator and the denominator by 25 as:

So, the fraction in its simplest form is -1/4

The starting point is 1,365 miles .

Given :

→ initial time of plane = 1.7 hours

→ initial speed = 140 mph

→ final time of plane = 9.6 hours

→ final speed = same = 140 mph

The initial displacement of the plane is :

distance = speed × time

= 1.7 × 140

= 238 miles

The final displacement of the plane is :
distance = 9.6 × 140

= 1,344 miles

The angles between initial and final displacement is :

100° - 10 ° = 90 °

The distance of the plane from its starting point is calculated as follows

d = [tex]\sqrt{238^{2}+ 1344^{2} }[/tex]

d  = [tex]\sqrt{56644 + 1806336}[/tex]

   = [tex]\sqrt{1862980}[/tex]

    = 1364.9 miles ≈ 1,365 miles

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It is determined that 188 students should be sampled to use the confidence interval for a proportion.

π ± z√π(1-π)/n

In which case,

z is indeed the z-score with the p-value of 1+α/2

The error margin is as follows:

M = z√π(1-π)/n

In this case:

Then:

M = z√π(1-π)/n

0.02 = 1.96√0.02(1-0.02)/n

√n = 13.72

n = 188.23

To summarize:

A total of 188 students must be sampled to estimate the proportion of of students who owns a scooter.

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Answer: 6

Step-by-step explanation:

1. add (0.5 + 4.5) which equals 5, so now you have 2 x 5^2.

2. evaluate the power (5^2) which equals 25 and you end up with 2 x 25 which equals 50.

3. now you have 300 divided by 50.

300 divided by 50 is 6.

The value of the expression 300 divided by 2(0.5 +4.5)²is 6

Simplification is reducing the expression/fraction/problem to a simpler form. It makes the problem easy with calculations and solving.

Given an expression, 300 divided by 2(0.5 +4.5)²

300/2(0.5 +4.5)²

= 300/2x5²

= 300/2x25

= 300/50

= 6

Hence, The value of the expression 300 divided by 2(0.5 +4.5)²is 6

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8 feet is known to equal 96 inches.

48 inches are divided in half,

and because the image is hung in the middle of the wall,

the subject of the image is that,

11 inches on each side, as well.

This is,

37 inches of wall on each side of 48-11.

A rectangle is a closed figure with four equal and opposite sides. Consequently, the length, which is also known as the height, and the width of a rectangle can be used to define it (sometimes called breadth).

The formula for a rectangle's surface area is as follows:

A=lxw

A=l×w

where:

A is the surface area of the rectangle;

L specifies the length of the rectangle.

Usually, it refers to the longest side of the rectangle.

W is the rectangle's width which is rectangle's shortest side.

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The probability that the mean age of a sample of 36 vehicles is between 98 and 100 months is 15.71%.

For the given question;

The data for the vehicles registered in the united states is given as-

The formula for the z score is-

z = (x - μ)/(σ/√n)

Put the values.

√n = √36 = 6

For x = 98 months

z = (98 - 96)/(15/6)

z = 0.8

p(z < 0.8) = 0.7881

For x = 100 months

z = (100 - 96)/(15/6)

z = 1.6

p(z < 1.6) = 0.9452

P(0.8<x<1.6) = 0.9452 - 0.7881

P(0.8<x<1.6) = 0.1571

Thus, the probability that the mean age of a sample of 36 vehicles is between 98 and 100 months is 15.71%.

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a computer randomly selects 800 names from a list of all registered voters. Then option C  is correct  that is Simple random sampling

A simple random sample in statistics, is a subset of individuals chosen from a larger set. Each individual is chosen randomly and entirely by chance, such that each individual has the same probability for the entire larger set.

the complete question is

Identify the sampling method as simple random​ sampling, systematic​ sampling, convenience​ sampling, or stratified sampling. A computer randomly selects 800 names from a list of all registered voters. Those selected are surveyed to predict who will win the election for Mayor.

Choose the correct sampling technique below.

A. Systematic sampling

B. Convenience sampling

C. Simple random sampling

D. Stratified sampling

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