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alekssr [168]
3 years ago
6

A teacher interested in determining the effect of a new computer program on learning to read conducted a study. One hundred stud

ents were randomly assigned to one of two groups. The first group used the computer program while the second group did not. Both groups were tested to determine how much their reading levels improved. The results for the two groups were compared. What kind of study is this?
1.This is an experiment because a treatment was applied to a group.
2.This is an experiment because students were able to choose which group to join.
3.This is a survey because students were randomly assigned to groups.
4.This is a survey because a treatment was applied to both groups
Mathematics
1 answer:
slava [35]3 years ago
6 1

Answer:

c

Step-by-step explanation:

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A sphere of radius 3 inches is sliced with two parallel planes: one passes through the equator and the other is H inches above t
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Answer:

V = (π/3)H(27 – H2) : Please see attachment

a. Volume =26π/3

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Step-by-step explanation:

Please see attachment

6 0
2 years ago
On the number line, between what two consecutive whole numbers is square root 54
rusak2 [61]
<span>The problem is basically asking you to approximate the square root of numbers that are not perfect squares. You should be able to recognize that 54 is very close to 49 and you should know that the square root of 49 is 7. You should also know that the next perfect square is 64 (whose square root is 8). Therefore the square root of 50 is between 7 and 8, but closer to 7 since 50 is closer to 49.</span>
6 0
3 years ago
if you run for 4 hours at 8miles an hour and walk 8 hours at 2 miles an hour, how far will you you have gone at the end of 12 ho
wariber [46]

Answer:

48 miles

Step-by-step explanation:

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4 0
3 years ago
Read 2 more answers
It takes Sue, Jeff and Todd 4 hours to paint a room together. If it takes Sue 10 hours by herself and Jeff 12 hours by himself,
diamong [38]

The number of time it would take Todd to paint the room alone is 15 hours.

  • Let the Todd's time be t.

<u>Given the following data:</u>

  • Combine time = 4 hours
  • Sue's time = 10 hours
  • Jeff's time = 12 hours

To calculate the number of time it would take Todd to paint the room alone:

How to solve a word problem:

In order to solve this exercise, we would first of all calculate their individual rate and combined rate respectively. Finally, we would add their individual rates together and equate it to the combined rate.

<u>For </u><u>Sue</u><u>:</u>

Rate = \frac{1}{10} \;work/hr

<u>For </u><u>Jeff</u><u>:</u>

Rate = \frac{1}{12} \;work/hr

<u>For </u><u>Todd</u><u>:</u>

Rate = \frac{1}{t} \;work/hr

<u>Combined rate:</u>

Rate = \frac{1}{4} \;work/hr

Adding the individual rates, we have:

\frac{1}{10} +\frac{1}{12} +\frac{1}{t} =\frac{1}{4} \\&#10;\\&#10;

Multiplying all through by 120t, we have:

12t+10t+120=30t\\&#10;\\&#10;22t+120=30t\\&#10;\\&#10;120=30t-22t\\&#10;\\&#10;120=8t\\&#10;\\&#10;t=\frac{120}{8}

t = 15 hours.

Read more on word problems here: brainly.com/question/13170908

5 0
2 years ago
What is the answer to X^2-2X+5=0 rounded to nearest hundreth
eimsori [14]
First you input the equation into the quadratic formula:
                  __________
x=<span><span><span>−<span>(<span>−2</span>)</span></span>±<span>√<span><span><span>(<span>−2</span>)</span>2</span>−<span><span>4<span>(1)</span></span><span>(5)</span></span></span></span></span>
</span>     -----------------------------      
                     2(1)
 Next you simplify the formula:
            ___
 x=<span><span>2±<span>√<span>−16
</span></span></span></span>    ------------
            2

This problem has no real solutions. 
 
8 0
3 years ago
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