What percent of 50 is b

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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