What is the direct variation between x and y when x=7 and y=3 1/2?

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

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Given sin∅ = 1/3 and 0 < ∅ < π/2 ; find tan2∅ a. (4√2)/9 b. 9/7 c. (4√2)/7 d.7/9