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Alex_Xolod [135]
3 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]3 years ago
6 0

Answer:

Observational study

Step-by-step explanation:

Just took the test

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Andre runs at a constant speed, 5 meters every 2 seconds. how long does it take him to run 91 meters at this rate
kap26 [50]

Answer: 36.4 seconds

(Unitary method)

5 meters take 2 seconds

1 meter takes 2/5 seconds

91 meter takes 2/5 * 91 --> 36.4 seconds

5 0
3 years ago
Tristan has 45 apples and 20 pears that he is putting into gift baskets. Each basket will have the same number of apples and pea
Leto [7]

Hi!

See the diagram I made.

<h3>Find the GCM of 45 and 20. </h3>

Factors of 45: 1, 3, 5, 9, 15, 45

Factors of 20: 1, 2, 4, 5, 10, 20

<h3>So make 5 groups of apples and pears. </h3><h2>The answer is 5</h2>

Hope this helps! :)

-Peredhel

4 0
4 years ago
What is the value of x?
Jlenok [28]

Answer:

4

Step-by-step explanation:

Cause as you can see at the top it shows 18 and if you multiply 4 two times you get 8 so then you get 10+ 2x

6 0
3 years ago
2t - 9 - 6t + 2 i really need help
MakcuM [25]

Answer:

-4t-11

Step-by-step explanation:

rearrange the numbers

2t-6t-9+2

Add negative 2

2t-6t-11

2-6

-4t-11

3 0
2 years ago
Solve the equation for x.<br> 4x + ax = 2(bx + 3)
a_sh-v [17]

Answer:

x = \frac{6}{4+a-2b}

Step-by-step explanation:

Given

4x + ax = 2(bx + 3) ← distribute parenthesis

4x + ax = 2bx + 6 ( subtract 2bx from both sides )

4x + ax - 2bx = 6 ← factor out x from each term on the left side

x(4 + a - 2b) = 6 ← divide both sides by (4 + a - 2b)

x = \frac{6}{4+a-2b}

3 0
3 years ago
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