SOH CAH TOA
CAH
Cosine = Adjacent / Hypotenuse
∆ABC, where lets say B is the right angle.
cos C = adjacent/hypotenuse = BC/AC
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The answer is choice A.
Coupon - (-2.50)
3 - 2.50 = .50
4 - 2.50 = 1.50
5 - 2.50 = 2.50, etc.
I hope this helps!
They must have the same variable with the same exponent. The coefficient doesn't matter much.