HELP!! Simplify the expression.
2x^3y + 7x^3y - xy^3

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.

What ia the sum if the first 7 terms of the geometric series