Question

Based on the figure below, what is the value of x?

3
9
12
15

Answer 1

since this is a right triangle the total degrees have to be 90 

5x + 15 
5 x 9 = 45 
45 + 15 = 60 
= 5(9) + 15 

60 + 30 = 90 

the answer is 9 

Answer 2

The triangle is 90*
90-30=60. 60-15=45. 45/5=9
x=9