Factor completely?

-5x^2y+10xy-15xy^2

Giving 100 points asap bev has to cut her grandma's grass this weekend and wants to know exactly how much area she will be cutting. calculate the area of the polygon. be sure to show all your work and explain your answer.

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts