Please help me im literally crying help if I fail i give up i can't.​

Which equation matches the graph shown ?

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.