Do those two problems have the same answer?

1. are the triangles similar and if so why? what is the value of x? show your work.

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

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15