The length of a rectangle is 4m more than the width. the area of the rectangle is 45 m^2.find the length

If an athlete can bike 6 miles in 25 minutes, how many miles will he bike in an hour and half if he continues to bike at the same rate?

The pyramid shown has a square base that is 24 centimeters on each side. the slant height is 16 centimeters. what is the lateral surface area?

Solve x+3y=6 and 4x-6y=6 by elimination . show work !