The formula for the future value v (in dollars) of an investment earning simple interest is v=p+prt, where p (in dollars) is the principal, r is the annual interest rate (in decimal form) and tt is the time (in years).

a. solve the formula for p.

p=

b. an investment earns 8% simple interest. what amount of principal is needed to have $6000 after 7 years? round your answer to the nearest cent.

amount of principal: $

One positive number is 9 more than twice another. if their product is 95, find the numbers

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?

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17