Question

The function j(x) = 39x represents the number of jumping jacks j(x) you can do in x minutes. How many jumping jacks can you do in 5 minutes? 7 jumping jacks 195 jumping jacks 234 jumping jacks 144 jumping jacks

Answer 1

First plug the 5 into the function.
J(x)=39(5)
Then simplify
j(x)=195
Meaning you can do 195 jumping Jack's in 5 min

Answer 2

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