What is the area of a polygon with vertices (3,2),(1,-2) and (-3,5)?

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

Find the sum of the given arithmetic series. 24 + 17 + 10 + 3 + + (–39)

What is the slopeof the live that passes through the points and (-2,-5) and (3,-1)