A^2 + b^2 = c^2
3^2 + 4^2 = c^2
9 + 16 = c^2
25 = c^2
5 = c
All we need to do is plug the numbers into the equation.
A:

Not A.
B:

Not B.
C:

C is the correct answer
Sorry I was moving around taking the picture and my handwriting is sloppy. But I hope you understand how I got the answer
Answer:
Option C. 
Step-by-step explanation:
we know that
The surface area of the triangular prism using the net is equal to the area of two triangles plus the area of three rectangles
so



Answer:
12 Hours
Step-by-step explanation:
h=21/14*8
h=12 hours