Question

The function j(x)=39x represents the number of the jumping jacks j(x) you can do in x minutes how many jumping jacks can you do in 5 minutes

Answer 1

Answer:

$195\ jumping\ jacks$

Step-by-step explanation:

Let

x------> the time in minutes

j(x)----> the number of the jumping jacks

we have

$j(x)=39x$

This is a linear direct variation

The slope is equal to $m=39\frac{jumping\ jacks}{minute}$

To find how many jumping jacks can you do in $5$ minutes

Substitute the value of $x=5\ min$ in the function j(x)

so

$j(5)=39(5)=195\ jumping\ jacks$

Answer 2

Put x=5 in above function. J(x)= 39x. J(5) = 39x5 = 195.