How do I answer this and I need explanation pls

Answer:

A.  We know that this was an experiment rather than an observational study because treatments were administered, with the first group receiving the experimental drug, the second group receiving a placebo, and the third group receiving no treatment."

B. The factors are the variables.  The independent variable was group three that received no treatment, while the dependent variables were the first and second groups that received some treatments.  Another variable is the change in blood pressure recorded at the end of the period.

The levels refer to the different treatments that were administered to the three groups: experimental drug, placebo, and no treatment.

C. The principles of experimental design are Randomization, Repetition, and Control.  We are not aware of how the participants were chosen and this experiment was not replicated in the scenario.  We can affirm that there is Control because the three groups were not given the same treatment.

Step-by-step explanation:

In an observation, the researcher does not attempt to change any variables.  She simply observes and then records her observations.  In an experimental study, the researcher creates a control group and, also at least, one testable group.  The purpose is to compare the control group and the testable group.

Answer:

y=9

Step-by-step explanation:

5(y-10)=-5

5y-50=-5

+50 +50

5y=45

/5 /5

y=9

Answer:

A) Airplane A has a lesser median

Step-by-step explanation:

If you look at the photo you see both airplane A and airplane B and if you were to line them up

airplane A=3

airplane B=4 ½  

so clearly airplane A would have a lesser median than airplane B

Answer:

4

Step-by-step explanation:

Vertical angles are angles formed when two straight lines intersects at a point forming vertical angles that share the same vertex and are directly opposite to each other.

In the diagram given, we have the following pairs of vertical angles:

<7 and <9

<8 and <10

<12 and <14

<11 and <13

Therefore there are 4 pairs of vertical angles

Answer:

20 students offered both physics and biology.

Step-by-step explanation:

n(Total) = 50

n(Physics) = 40

n(Biology) = 30

Let n(Physics and Biology) = x

n(Physics only) = 40 -x

n(Biology only) = 30 - x

40 - x + 30 - x + x = 50

70 - x = 50

x = 20

Answer:

12

Step-by-step explanation:

Answer: 12

Step-by-step explanation:

The diameter is just the radius*2 so the diameter is 12

Answer:

A. < B. < C. >

Step-by-step explanation:

Answer:

c

Step-by-step explanation:

cause he has to devide by a negative

Answer:

?

Step-by-step explanation:

Answer:

it would be

18 x 5x = 915

solve the equation

18 x 5 = 90

90x = 915

divide by 90

x =10.1666

Step-by-step explanation:

Answer:

f

Step-by-step explanation:

Green vines attached to the trunk of the tree had wound themselves toward the top of the canopy. Ants used the vine as their private highway, avoiding all the creases and crags of the bark, to freely move at top speed from top to bottom or bottom to top depending on their current chore. At least this was the way it was supposed to be. Something had damaged the vine overnight halfway up the tree leaving a gap in the once pristine ant highway.

The whole numbers will be:

{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}

Remember that a square root will have a whole number as an outcome only if the input is a square number.

Then, what we can do here is just find all the square numbers smaller than 200.

1*1 = 1

2*2 = 4

3*3 = 9

4*4 = 16

5*5 = 25

6*6 = 36

7*7 = 49

8*8 = 64

9*9 = 81

10*10 = 100

11*11 = 121

12*12 = 144

13*13 = 169

14*14 = 196

Then, if we take the square roots of all the natural numbers from 1 to 200, we will have 14 whole numbers as outcomes, and these will be:

{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}

If you want to learn more about square roots, you can read:

https://brainly.com/question/8952483

Answer:

33.51 in^2

Step-by-step explanation:

Find the area of the circle:

A = πr^2

A = π * 8^2

A = 64π = 201.06 in^2

Find the area of the 60 deg slice:

A * 60/360 = 33.51 in^2

Leave a thanks and mark brainliest if this helped

Leave a thanks and mark brainliest if this helped

Answer:

395 .64 ft2

Step-by-step explanation:

hmm, let's see :

Pi = 3.14 r = 3 ft h = 14 ft

Volume = 3.14 * (3)2 ft *14 ft= 395 .64 ft2

— hope this helped :)! (sorry if there is any mistake !!)

Answer

$199.8

Explanation:

Find the total amount of money he had in the begining. It says that he can spend $18 on each student. He has 18 students so you would multiply that by the $18 he can spend which gives a total of $324 then you subtract the total cost of the calculators from it which then gives you $199.8

Answer:

20579.52628

Step-by-step explanation:

4/3 pi(r^3)

4/3 pi x 17 x 17 x 17

= 20579.52628

Answer:

20579.5

Step-by-step explanation:

The formula for The volume of a Sphere is 4/3 pi r^3

so it would be 4/3pi *  4913

4.19666666....* 4913 which would equal to  20.579.53333333333 or 20579.5

Answer:

72

Step-by-step explanation:

9 x 8 = t

t = 72

Answer: (A)

[tex]H_0:\mu=75\\H_a:\mu\neq75[/tex]

(B)

[tex]H_0:\mu=24\ sec\\H_a:\mu>24\ sec[/tex]

(C)

[tex]H_0:\mu=850\ ft^2\\H_a:\mu<850 \ ft^2[/tex]

Step-by-step explanation:

(A)  Objective: Scores in second-year calculus are scaled so the average each year is equivalent to a 75 or not.

[tex]H_0:\mu=75\\H_a:\mu\neq75[/tex]

(B) Objective: The mean time is 24 seconds or more for one particular maze.

[tex]H_0:\mu=24\ sec\\H_a:\mu>24\ sec[/tex]

(C) Objective: The average square footage of one-bedroom apartments in a new student-housing development is advertised to be 850 square feet or smaller.

[tex]H_0:\mu=850\ ft^2\\H_a:\mu<850 \ ft^2[/tex]

Answer:

(0,-4)

(3,0)

Step-by-step explanation:

Let start at the orgin.

This is a linear equation since the equation is in the form of

[tex]y = mx + b[/tex]

where m is the slope and b is the y intercept.

Since we starting at the orgin, and b is our y intercept.

Our first point is

(0,-4).

since the slope is 4/3.

We would rise 4 from the y value and run 3 to the x value.

In other words, to find your second point, go up 4 units from the first point and move to the right 3 units.

So our next point is at

(3,0).

U can continously go up 4 units and move 3 units to the right to find other points.

Answer:

2 more sides.

Step-by-step explanation:

Decagon = 10 sides

Octagon = 8 sides

The prefix Octa means 8 sides

example : Octa is in Octapus; and octopus have 8 legs or tentacles.

Answer:

2 sides.

Step-by-step explanation:

Correct me if I'm wrong but a decogon has 10 sides and an ogtagon has 8 sides so it might be 2.

Answer:

82 points

Step-by-step explanation:

Take 22 and add 20 back to it, and then multiply it by four which gives you 102. You then would subtract 20 and get 82.

Answer:

11. a)50      12. a)40

Step-by-step explanation:

sum of  all three angles of  trinagle=180

so

111.

80+50+x=180

130+x=180

x=180-130

x=50

12.

60+90+x=180

150+x=180

x=190-150

x=40

Answer:

A and C

Step-by-step explanation:

Answer:

The answer is A.

Step-by-step explanation:

Hope this helps.

Respuesta:

La fracción equivalente a 0.01 es 1/100.

Answer:

Sale Price = $29.05 (answer). This means the cost of the item to you is $29.05. You will pay $29.05 for a item with original price of $35 when discounted 17%. In this example, if you buy an item at $35 with 17% discount, you will pay 35 - 5.95 = 29.05 dollars

Answer:

It decreased by 25%

Step-by-step explanation:

8 x .25=2

8 - 2 = 6