Answer:
D) 24.5
Step-by-step explanation:
use the pythagorean theorem.

Plug in the values. 
a+ 625 = 1225
then solve for a by subtracting 625 from 1225 = 600
√600= 24.5
15 is an integer. The square root of 225 is 15.
Answer:
its ok don't worry
Step-by-step explanation:
its a mental answer
1 ft = 12 inches. 6.5 ft = 78 inches.
I hope this helps!
Depends on the calculator you have at your disposal. If it's one of the TI-83 series, you can use the built-in 'fnint' function.
https://brownmath.com/ti83/integr.htm