Answer:
3^2 would be the correct answer.
If x = 3 then y = 10
If x = -3 then y = -2
If x = 4 then y = 12
If x = -2 then y = 0
20
Step-by-step explanation:
Pythagorean Theorem: a^2 + b^2 = c^2
21^2 + b^2 = 29^2
441 + b^2 = 841
Subtract 441 on both sides to get b^2 = 400
Take the square root of both sides to get b = 20
c