You take a cab to a restaurant. The final bill of $31.72 included an 18% tip for the driver. What was the original bill?

Which graph represents the equation y =4x

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

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)