Prove that: 5^31–52^9 is divisible by 100. do it like *100

What is the simplified expression for 6(2(y+x))

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?

Which of the following circles have their centers in the third quadrant? check all that apply.