Answer:
22
Step-by-step explanation:
Plugging the numbers into the equation, we get 10^2+20^2=c^2
10^2 is 100, and 20^2 is 400
400 + 100 is 500
find the square root of that, which is exactly 22.36068 but the problem says to round to the nearest whole number, so the answer is 22.
