Robert can paint a certain wall in 4 minutes, while it takes jack 12 minutes to paint the same wall. how long will it take robert and jack to paint the wall working together?

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.