The math department recently purchased new learning software for their freshman math classes. The instructors want to use the learning software instead of a textbook. So they decide to study the effectiveness of the software. First they test the skills and concept mastery for a number of the freshman math students. Then they randomly divide the students into two groups. One group uses the learning software for a particular lesson and the other group uses the regular textbook. Then the instructors retest all of the students and compare the improvement in the skills and concept mastery for the two groups. What is the purpose of random assignment in this experiment? Check all that apply.

Answer:

61 inches squared

Step-by-step explanation:

find the area of the rectangle then the area of the triangle and add.

Answer:

61 in²

Step-by-step explanation:

first u work out the rectangle. so u do 4 times 10 which is 40 . then u do 1.5 plus 1.5 plus 4 which equals 7 . then u do 7 times 6 which is 42 . 42 two divide by 2 = 21 . 21 plus 40 equals 61. answer 61.

area of triangle: base times height divide by 2 .

to work out area of rectangle : 4×10=40 in²

1.5+1.5+4= 7 in

area of triangle: 7×6=42 then divide by 2 = 21 in²

plus them to get the area of arrow : 21+40=61 in²

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Answer:

6h+ (-7.1d) -15+4d-3.4h

Step-by-step explanation:

Answer:

There are 9 000 000 = 9 million reptiles in the US.

Step-by-step explanation:

Percentages and ratio:

The double of a measure, for example, is 200% of the measure.

So 1000% of a measure is 10 times the measure.

There are 90 million pet dogs in the US. The number of dogs is 1000% the number of reptiles.

The number of pet dogs is 10 times the number of reptiles, which means that:

[tex]10x = 90 000 000[/tex]

[tex]x = \frac{90 000 000}{10}[/tex]

[tex]x = 9 000 000[/tex]

There are 9 000 000 = 9 million reptiles in the US.

Answer:

Step-by-step explanation:

Step 1: Simplify both sides of the inequality.

8

x

−

12

<

8

x

+

8

Step 2: Subtract 8x from both sides.

8

x

−

12

−

8

x

<

8

x

+

8

−

8

x

−

12

<

8

Step 3: Add 12 to both sides.

−

12

+

12

<

8

+

12

0

<

20

Answer: 58.5

Step-by-step explanation:

Answer: 8y+12r

Step-by-step explanation:

Take the equation

2(4y)+4(3r)

Distribute the 2 and 4 into the parenthesis'

8y+12r

Answer:

1. A. symmetric, peak at 6

2. B. there is a peak at 5

Step-by-step explanation:

for 1. the x's are the same on both sides of the peak so it's symmetrical and the peak is just the highest point

hope this helps and pls mark brainleist

Answer: 2

Step-by-step explanation:

Every set of point is found if you go up twice and once to the right 2/1 = 2

Equation = Y = 2x + 4

Answer:

0.16

Step-by-step explanation:

Its 0.16 because it would be easiest to make 8/50 into 16/100 to make it easier to turn into a decimal.

Answer:

8.25 pounds

Step-by-step explanation:

Its $3 per pound, so 24.75/3= 8.25

Answer: 8.25 lbs.

Steps:

18 / 6 = 3 dollars per pound

24.75 / 3 = 8.25

Answer:

[tex]\frac{1}{4}[/tex]×2[tex]\pi[/tex]r=17.5[tex]\pi[/tex]

Step-by-step explanation:

Answer:

quisiera ayudarte pero no hablo inglés

Answer:

28

Step-by-step explanation:

7x=196

divide by 7

x=28

Answer:

28

Step-by-step explanation:

7x=196

divide by 7

X = 28

9514 1404 393

Answer:

  w = -2 or 8 1/3

Step-by-step explanation:

Setting the two expressions equal makes a quadratic equation:

  -5 +0.6w = w(2.5 -0.3w)

  0.3w^2 -1.9w -5 = 0 . . . . . . subtract the right-side expression

  3w^2 -19s -50 = 0 . . . . . . . multiply by 10 to give integer coefficients

  (3w -25)(w +2) = 0 . . . . . . . factor

We can use the zero product rule to find the solutions. The product will be zero only if a factor is zero.

  3w -25 = 0   ⇒   w = 25/3 = 8 1/3

  w +2 = 0   ⇒   w = -2

The values of w that make the two expressions equivalent are -2 and 8 1/3.

Answer:

Cos(a - b) = 0.959

Step-by-step explanation:

We know that:

Sin(a) = 4/5

Such that a is on the first quadrant (between 0° and 90°)

then:

Sin(a) = 4/5

Asin(sin(a)) = Asin(4/5)

a = Asin(4/5) = 53.13°

And:

Cos(b) = 2/5

Then:

Acos(Cos(b)) = Acos(2/5)

b = Acos(2/5) = 36.67°

Then:

Cos(a - b)

where:

a = 53.13° and b = 36.67°

Then:

Cos(a - b) = Cos(53.13° - 36.67°) = 0.959

Answer:

answer is A

Step-by-step explanation:

took the test :)

The option (A) she found one valid solution and no extraneous solution is correct, and x = -11/3 or -3.66.

It is defined as the combination of constants and variables with mathematical operators.

We have the equation:

[tex]\rm \dfrac{4}{x-2}+\dfrac{1}{x^2-4}=\dfrac{1}{x+2}[/tex]

After taking LCM

4x + 9 = x - 2

x = -11/3

or

x = -3.66

Thus, option (A) she found one valid solution and no extraneous solution is correct, and x = -11/3 or -3.66.

Learn more about the expression here:

brainly.com/question/14083225

#SPJ2

Answer and Step-by-step explanation:

Animal adaption for Birds.

Birds who live on a tropical island with large, hard shell nuts.

The birds have small beaks, but over time, their beaks become bigger, stronger, and sharper, so that it can break into the hard shell nuts, allowing them to eat the nuts.

#teamtrees #WAP (Water And Plant)

Answer:

Based on what I researched that would be False.

Step-by-step explanation:

Human capital deepening is the increase of capital workers, it also includes skills or higher education.

Answer:

Each part of the angle would measure 12 degrees

Step-by-step explanation:

Answer:

447

Step-by-step explanation:

7x = 21

2x = 6

21^2+6

441 + 6

447

9514 1404 393

Answer:

  3x +4y = -36

Step-by-step explanation:

The slope-intercept form is ...

  y = mx + b

where m is the slope and b is the y-intercept. From this equation, we can find the y-intercept as ...

  b = y -mx

For the given point and slope, this is ...

  b = -6 -(-3/4)(-4) = -9

Then the slope-intercept equation is ...

  y = -3/4x -9

We can multiply by 4 to get something we can put in standard form.

  4y = -3x -36

  3x +4y = -36 . . . . standard form equation

Answer:

2.1

Step-by-step explanation:

33/16=2.06=2.1

Answer:

an activity or purpose natural to or intended for a person or thing.

Step-by-step explanation:

: >

The function definition is given below..

A function is a relationship between inputs where each input is related to exactly one output.

Example:

f(x) = 2x + 1

f(1) = 2 + 1 = 3

f(2) = 2 x 2 + 1 = 4 + 1 = 5

The outputs of the functions are 3 and 5

The inputs of the function are 1 and 2.

We have,

A function is a relation that has an input and an output.

All the possible outputs are called codomains.

The inputs are called the domains.

The outputs are called the range.

A function can be many-to-one but not one-to-many.

Example:

f(x) = x²

For x = 1 and x = -1

f(x) = (1)² = 1 and f(x) = (-1)² = 1

This is many to one.

Thus,

The function definition is given above.

Learn more about functions here:

https://brainly.com/question/28533782

#SPJ6

Answer:

15.5 or 15 and a half cups of flour

Step-by-step explanation:

1/2 = 0.5

14 + 0.5 + 1 = 15.5

Answer:  3 5/12

or

2 17/12

Step-by-step explanation:

hope this helped!!

Step-by-step explanation:

In order to find the slope, we must know the formula needed.

[tex]\frac{y2}{x2} -\frac{y1}{x1} =m[/tex]

Using 2 given points, we can subtract both and receive our final answer.

Points that are provided:

Substitute the given points into the formula format.

Then, solve.

[tex]\frac{3}{4} -\frac{-1}{1} =\frac{4}{3}[/tex]

m = 4/3

The slope is positive. Meaning that the slope is increasing for the value of y.

Answer:

19.5 degrees

Step-by-step explanation:

180 - (33.5 + 127) =

180 - 160.5 =

19.5

Hope that helps!