To determine the number of subjects that are needed for the experiments, we multiply the number of independent variables with the number of scores. For example, there are n independent variables then, there are approximately,
number of subjects = 20 x n = 20n
Answer:
27,81, 243
Step-by-step explanation:
The product of the expression
is the expression 
<h3>What is an
equation?</h3>
An equation is an expression that shows the relationship between two or more variables and numbers.
Given the expression:

The product of the expression
is the expression 
Find out more on equation at: brainly.com/question/2972832
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I'm sorry but I really can't see the picture
(1/15) / (1/3) = 1/x
cross multiply
1/15x = 1/3
x = 1/3 * 15
x = 15/3
x = 5 hrs