The area of a rectangle is 12cm^2. the width is 4 cm less than the length. find the perimeter

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.