I'm pretty sure the answer is D. 0.9196
Answer:

Step-by-step explanation:
Given



Required
Find y when x = 30
Being an inverse variation, we have:

Convert the variation to an equation

First, we solve for k
Make k the subject to solve for k


So, the value of k is:


To solve for y when x = 30
Substitute 30 for x and 42 for k in 

Make y the subject


Answer:
sin A = opp/hyp = 15/17
Right triangle
Therefor
a² + b² = c²
adj² + opp² = hyp²
adj² + 15² = 17²
adj² = 17² - 15²
adj² = 289 - 225
adj² = 64
adj = 8
Cos = adj/hyp
cos A = 8/17 <–––––
Step-by-step explanation:
The answer to this would be x=0 if I’m not mistaken.