Find the midpoint of the segment with the following endpoints.
(-1,9) and (-7,1)

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Asap! i'm not good math and i'm lost.

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.