According to the rule of 72, in about how many years will $20 be worth $10 if the rate of inflation is 6%?

a. 48 years
b. 6 years
c. 24 years
d. 12 years

Given a circle with a radius of 4, which is the circumference

Do 12/14 and 8/10 have the same value? explain your answer.

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?