I know how to but i don't know how to reply with a picture
Please, share the goal of the problem. If Carrie works 40 hours per week and spends 15% of her time at the register, how much time does she NOT spend at the register?
Subtract 15% from 100%; the result is 85%. Now find 85% of 40 hours:
0.85(40 hours) = 34 hours.
Please note that I invented part of this problem. Next time, share all of the info so that someone can help you solve YOUR particular problem.
The formula of an area of a square:

a - a side
We have 
substitute:

Used:

Haha what? Is this like a joke..how does a cat have 18 legs.what that’s confusing