Aileen deposited money into an account in which interest is compounded semiannually at a rate of 2.1%. how much did she deposit if the total amount in her account after 3 years was $3952.08, and she made no other deposits or withdrawals?
a) $3489
b) $3562
c) $3712
d) $3751

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

Ithink i know it but i want to be sure so can you me out ?

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2