Here is some to start you off.
Basically, you have to square root it.
10. Square root of 25 is 5 to t = 5.
11. k = 22
12. z = 16 because 16x16=256 then 256 - 256 is 0.
13. You do the opposite to get your answer. -50 + 14 = -36. Square root of 36 is 6. d = 6.