If you dilate rectangle ABCD with a scale factor of 3, what is the length of A'D'? A'D' is 5 units A'D' is 7 units A'D' is 2 units A'D' is 3 units

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.