Question

What is the legth X of the side of the triangle below?

Answer 1

the answer is D) 9.1. 

Answer 2

For this case we have the following trigonometric relationship:
cos (25) = x / 10
From here, we must clear the value of x.
We have then:
x = 10 * cos (25)
x = 9.06307787
Rounding the result we have:
x = 9.1
Answer:
x = 9.1
option D