Please help! I need to turn this in ASAP! I will give you the Brainiest..

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15