Answer: 7%
Step-by-step explanation:
Your answer is A. You literally plug in the numbers for a and b to solve for the equation.
Marco's equation is correct. Cosine is an even function, which means that for every x, f(-x) = f(x). In other words, you get the same answer for a negative value that you would for its corresponding positive value.
I believe the answer is 240.
8000 * .03 = 240
