The value of the third side to the nearest tenth uses the Pythagorean Theorem.
Givens
You are given a right triangle
You are given one side = 7
You are given the hypotenuse = 12
Formula
a^2 + b^2 = c^2
a = 7
b = x
c = 12
Solution
7^2 + x^2 = 12^2
49 + x^2 = 144 Subtract 49
x^2 = 144 - 49
x^2 = 95 Take the square root of both sides.
x = sqrt(95)
x = 9.7
Answer B <<<<
