Pls help, and explain. Will give brainliest

You can do 13 divided by 9 to see how much each binder costs. 12 divided by 9 is 0.75 which means, that each binder is 75 cents. To get your answer do 0.75 x 8. Which equals 6. Which means 8 binders would cost six dollars

On monday,mrs.wise bought 3 lbs of apples at $4per lb= 4*3=$12on tuesday ,20%off and she buy 5 lbs of apples = $4-20%=3.20*5lb=$16example: other wise when she buy 5lbs on monday she have to spend 4*5=20

paul's with a y-intercept of $ 2856