Answer please and explain

In the 30-60-90 triangle below side s has a length of and side r has a length

What statement is true? 2x^2-9x+2=-1

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