Question

Write an expression for the amount of change you will get when you pay for a purchase p with a $20 bill. Make a table for the amount of change you will get for purchases of $11.59, $17.50, $19.00 and $20

Answer 1

Let p be the purchase price, and c be the change.
Expression: $20.00 - p = c
Table (you'll have to imagine it as a table)

When p is | Then C is
11.59 | 8.41
17.50 | 2.50
19.00 | 1.00
20.00 | 0.00