Please help quickly!
The principal P0 is invested in an account that pays an annual interest rate r (written as a decimal), compounded n times per year.

The formula for the amount of money in the account at the end of the first period is given by the formula:
P=P˅0(1 + r/n)^n
Explain why the amount of money in the account at the end of the first year is given by the formula with n as the exponent:
P=P˅0(1 + r/n)^n

Ps. ˅ is a subscript arrow

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)