If y varies directly as x and x=9 when y=18, find x when y = 3

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items