Answer:12.6
Step-by-step explanation:you add all of the numbers then divide by how many numbers you have
A^2 + b^2 = c^2
x^2 + 8^2 = 20^2
x^2 + 64 = 400
x^2 = 336
x = 4sqrt(21), or ~=~ 18.3303028
The answer for -14+19 is 5
$87.5 i believe (sorry if it is wrong)