At a restaurant, your total bill is $78. If you leave a 20% tip, how much money will the tip be? Explain how you find your answer

Cherie measures and records the lengths and sizes of the same style of a sandal found at a shoe store. which equation can be used to determine the approximate shoe size, s, for a foot length of x inches? s = x – 2 s = 2x – 10 s = x + 6 s = 2x + 4

Which is the completely factored from of xy^3-x^3y

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie