a 2 1/2" pipe has 1 3/4" diameter opening, as shown below. what is the thickness of the pipe's wall?​

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)