What is the value of the expression m + (7•9) over 9? pls

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Which of the following expressions is equal to 2x^2+8

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?