After 3 years, a $1,500 investment is worth $1,680. What is the interest rate on the investment? 0.04 percent
2.0 percent
4.0 percent
37.3 percent

What is the first step of an indirect proof of a number that is divisible by two

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).