The circumference of a circular pizza pan is 5 pie or 15.7079632679...,inches. Is this number rational or irrational?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25