Hello! Can someone help me with my math homework? I just need the answers to 1 to 3! Thank you very much

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Compare the following pair of numbers a and b in three ways. a. find the ratio of a to b. b. find the ratio of b to a. c. complete the sentence: a is percent of b. a=120 and b=340 a. the ratio of a to b is . b. the ratio of b to a is . c. a is nothing percent of b.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?