Mary uses 1/4 of a cup of fruit for every 1/2 of a cup of yogurt for her snack. Enter the number of cups of fruit Mary uses for every one cup of yogurt. Help please!

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.