Question

Find the value of x. Round the answer to the nearest tenth, if needed.

A.
9
B.
18.9
C.
22
D.
32.1

Answer 1

From the figure, we can set up three equations with three unknowns so that we can calculate the value x. The equations are as follows:

y^2 = x^2 + 49^2 --->
70^2 = z^2 + y^2
z^2 = 21^2 + x^2

Solving simultaneously, we obtain,
x = 7√21 = 32.1 <------- OPTION D

Answer 2

x/49 = 21/x
x^2 = 21(49) = 1029
x = √1029 = 32.1
x = 32.1