Ok so to start you can go ahead and multiple $4.50 by 6 because she is buying 6 books. 4.5*6 = 27 So subtract 27 from 39 39-27=12 Divide 12 by .25 12/.25 = 48 Now divide 48 pieces amount her 6 friends 48/6 =8 8 pieces for each of her friends
Since our plane is parallel to the xz plane, the x and z are independent of each other, i.e. they could be anything. So xz plane has an equation of y = 0. So if this plane is located 11 units to the right of the xz plane then its equation must be y = 11.
