Answer:
The answer is

Step-by-step explanation:

By the way can find y
Answer:
5^6
Step-by-step explanation:
5^5×5 = 5^5×5^1 = 5^(5+1) = 5^6
_____
This may become more obvious if you remember that an exponent signifies repeated multiplication:
(5^5)·(5) = (5·5·5·5·5)·(5) = 5·5·5·5·5·5 = 5^6
You have to times all the numbers together to get the surface area.
So that means you have to do 16*12*5.
2.4 is the fraction 24/10. Simplified, this is 12/5. Since the bottom is a prime number, and the top is not divisible by it, this is as far as we can simplify the fraction. Therefore the solution is 12/5.