What is the difference is x not equal to 0? 13x^2√7x^8-3√7x^12

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

Solve this problem! extra ! 3025/5.5 = a/90.75

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