The point p(9, 12) is on the terminal side of θ. evaluate cos θ.

P(9,12): For all intents and purposes, the hypotenuse is "r", the opposite side is "y", and the adjacent side is "x".

x = 9 (from the P(9,12))
y = 12 (also from the point)

Using the Pythagorean Theorem, you find out that r = 15.

Therefore, since cos θ = x/r
cos θ = 9/15 or 3/5

3/5

The answer is that the rate of change is $50 per 1 monthhope this ; )