Does anyone know how to do this question?

no im sorry, i cannot solve this

Step-by-step explanation:

for a better answer make sure to post this question again and see what people say

ummm seems that u didnt post the attachement !

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.