12^2 + 9^2 = 225
the square root of 225 = 15
x = 15
Answer: 15, or d
Step-by-step explanation:
use Pythagorean Theorem. We are trying to find c^2, or the hypotenuse.
a^2+b^2=c^2
12^2+9^2=c^2
144+81=c^2
225=c^2
√225= √c^2
15=c
Your answer is D.
