The top question is B. 30, because you have to set 7y-30 equal to 4y+60 since both lengths are the same.
The difference is 180 is the correct answer for the problems
Answer:

Step-by-step explanation:
9) Since Alicia Martin's savings earns 6% quarterly for two quarters then:
⇒ Amount (A), Principle (P), rate (r) in decimal form, number of compoundings (n) a year and t, in year or its fractions.

10) Aubrey Daniel's case:

11) As for Angelo, similarly to Alicia.

12) Simpson's. For semiannual n=2

13) Jana Lacey amount:

The answer is c so i would pick that beacuse its sounds like a correct answer.