What fraction does each month have of a year

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

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Simplify the following expression 48^1/2