Justin gave the clerk $20 to pay a bill of $6.57. how much change will justin get

Data are collected to see how many ice-cream cones are sold at a ballpark in a week. day 1 is sunday and day 7 is the following saturday. use the data from the table to create a scatter plot.

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

What is the number 321,000,000 in scientific notation? also what is the number? ?