Can anyone me ? also explain if you can. you : )

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3

Find the solution on the interval [0, 2pi)

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.