I need help I think I got x but I need z and y

it is true

step-by-step explanation:

all the combinations add up i used   calculator

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

they would have to work 32 hours.