Which of the following relations is not a function?
a.
(-3, 4), (0, 2), (6, 1), (-7, 5)

b.
(0, 4), (-3, 2), (0, 1), (-7, 2)

c.
(-7, 4), (0, 3), (-3, 1), (6, 2)

d.
(6, 4), (-3, 2), (0, 1), (-7, 2)

S-7< 3 i need answering this problem someone asap answer

Taking algebra two apex courses and need with these questions

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