Which type of statement must be proven in geometry?
a) axiom
b) definition
c) postulate
d) theorem

Scott harris can invest $7,000 in a 1-year cd that earns interest at an annual rate of 4 percent compounded monthly. the amount per $1.00 is 1.040742. he can also invest $7,000 in a 1-year cd at annual rate of 4 percent compounded quarterly. the amount per $1.00 is 1.040604. what is the difference in the amount of interest earned for each investment? a) $0.96 b) $0.81 c) $0.87 d) $0.88

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).