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Alex_Xolod [135]
2 years ago
10

a researcher is studying the effects of playing chess on memory improvement. he identifies 50 people who play chess and 50 peopl

e who do not. each of the 100 people is given a questionnaire designed to determine memory level. none of the 100 people who participated in the study knew they were part of a study. which statement is true.
Mathematics
1 answer:
Sever21 [200]2 years ago
6 0

Answer:

Observational study

Step-by-step explanation:

Just took the test

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Isabella has a board that is 5.24 feet long and 1.34 feet wide. ​
Masteriza [31]

Answer:

<u>Length of 1 piece= Length of total divided by 8</u>

Step-by-step explanation:

Length of total= 5.24 feet long

Width of total= 1.34 feet wide

Width is divided by 1 line so, there are 2 parts.

Width= 1.34 divided by 2

Width= 0.67 feet wide

Length is divided by 7 lines, so there are 8 parts.

Length= 5.24 divided by 8

Length=0.655 feet long

They are asking for formula to find the length of each piece

<u>Length of 1 piece= Length of total divided by 8</u>

<u></u>

Hope that helps!

8 0
3 years ago
I WILL MARK BRAINLIEST IF THIS IS ANSWERED IN LESS THAN 30 MIN.
Luden [163]

Answer: 9.5

Step-by-step explanation:

3 0
3 years ago
If m ∠ 8 = 65 degrees, what is m ∠ 5 ? (Image in details)
Nitella [24]
65°

It's opposite on a 180° line. 
7 0
3 years ago
A software designer is mapping the streets for a new racing game. all of the streets are depicted as either perpendicular or par
ElenaW [278]

The equation of the central street PQ is  -1.5x - 3.5y = -31.5 option (b) is correct.

<h3>What is a straight line?</h3>

A straight line is a combination of endless points joined on both sides of the point.

We have a straight line:

-7x+3y=-21.5  

Convert it to the general form given below:

\rm y=mx+c

\rm 3y=-21.5+7x\\\\ \rm y = \frac{-21.5}{3}+\frac{7}{3}x or

\rm y = \frac{7}{3}x-\frac{21.5}{3}

m = \frac{7}{3}   (Slope of AB line)

For the slope(m') of the PQ line:

\rm m'=-\frac{1}{m}    ( because AB and PQ are perpendicular to each other)

\rm m' = -\frac{3}{7}

We know the:

\rm (y-y')=m'(x-x')

Where (x', y') = (7, 6), we get:

\rm (y-6)=-\frac{3}{7} (x-7)

\rm 7(y-6)=-3 (x-7)\\\\\rm 7y-42= -3x+21\\\\\rm 7y= -3x+21+42\\\\\rm 3x+7y=63

\rm -1.5x-3.5y=-31.5   (multiply by -1/2 on both sides)

Thus, the equation of the central street PQ is  -1.5x - 3.5y = -31.5

Learn more about the straight line.

brainly.com/question/3493733

6 0
2 years ago
What is 9/11=?/22 need help with this problem
KengaRu [80]
When you solve proportions, you have to cross multiply.

       9       x
      ---  =  ---         Multiply each numerator by the opposite denominator.
      11      22

(9)(22) = 11x        Then, multiply.

     198 = 11x        Then, divide.

       18 = x

4 0
3 years ago
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