What is the trig function equation for this problem?

Use the cosine function where x° = 63.43°

Step-by-step explanation:

In relation to angle x°, side 3 is adjacent, and side 3√5 is the hypotenuse. Therefore, the trig function that uses the adjacent and hypotenuse is the cosine function. You would then set your equation up and solve for x°:

cos(x°) = adjacent/hypotenuse

cos(x°) = 3/(3√5)

x° = cos⁻¹(3/(3√5))

x° = 63.43°

x/3-10=8

x/3=18

x=48