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saveliy_v [14]
4 years ago
14

20. Give an example of a controlled experiment and an observational study.

Mathematics
1 answer:
Kryger [21]4 years ago
5 0

Answer:

We do studies to gather information and draw conclusions. The type of conclusion we draw depends on the study method used:

In an observational study, we measure or survey members of a sample without trying to affect them.

In a controlled experiment, we assign people or things to groups and apply some treatment to one of the groups, while the other group does not receive the treatment.

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What is 2x + 2x + 2y + 2y?
marin [14]

Answer:

4x+4y

Step-by-step explanation:

Only like terms can be added together so the numbers with the variable x are added together and numbers with the variable y are added together.

The expression can no longer be simplified since it has no other ways to.

7 0
3 years ago
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To obtain the number of centimeters from a distance measured in meters, move the decimal point _____.two places righttwo places
castortr0y [4]
The answer is the second option: T<span>wo places left. 
 
 Therefore, the complete text is: "</span>To obtain the number of centimeters from a distance measured in meters, move the decimal point Two places left ".
<span> 
 The explanation is:
 
 1 meter has 100 centimeters,  then, if you have a distance of 45.55 centimeters and you want to know this value in meters, you need to divide it by 100 or, in others words, you need to </span>move the decimal point two places left:
<span> 
 =(45.55 centimeters)(1 meter/100 centimeters)
 =(45.55x1)/100
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7 0
3 years ago
F(x)=4x^2+3x+13<br><br> Find f(1)
Pani-rosa [81]

Answer:

f(1) = 42

Step-by-step explanation:

Step 1: Switch all x out to 1 for f(1) which would look like this: f(1)=4(1)^2+3(1)+13

Step 2: You would then simplify it starting with 4(1)^2 which would equal 4 squared which equals 16.

Step 3: After simplifying you would have f(1)=16+3+13

Step 4: You then just add and get 42

Hope this helped :D

7 0
3 years ago
What is the relationship between 1 and 2? WILL GIVE BRAINLYEST.
netineya [11]

Answer:

D

Step-by-step explanation:

6 0
4 years ago
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Someone please help and show work!! I will also mark brainliest. I’ll appreciate it.
Eduardwww [97]

Answer:

1. 53

2. 20

3. 37

4. 29

Step-by-step explanation:

Since your trying to find the hypotenuse you equation is...

1. 28^2 + 45^2 = C^2

    784 + 2025 = C^2

      Square Root 2809= C^2

    C=53

So after you square root 2809 you get 53.

2. 12^2 + 16^2 = C^2

     144 + 256 = C^2

      Square Root 400 = C^2

    C=20

So after you square root 400 you get 40.

3.  12^2 + 35^2 = C^2

    144 + 1225 = C^2

    Square Root 1369 = C^2

   C=37

So after you square root 1359 you get 37.

4. 20^2 + 21^2 = C^2

   400 + 441 = C^2

  Square root 841 = C^2

  C=20

So after you square root 841 you get 29.

5 0
3 years ago
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