How do you compare fractions decimals and percent?

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

Whats the name of the vertical axis

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