I think it is the 3 one from the left side
<span>x^0 y^-3 / x^2 y^-1
= 1 / </span> x^2 y^-1 (y^3) ...because x^0 = 1 and [(y^-1) (y^3)] = y^2<span>
= 1/(x^2 y^2)</span>
20 + 0.08x = 16 + 0.13x
20 - 16 = 0.13x - 0.08x
4 = 0.05x
x = 80 minutes
20 + 0.08(80) = 16 + 0.13(80)
20 + 6.4 = 16 + 10.4
$26.40
thanks for the free points