Kate wants to buy some notebooks (n), each costing $7, and a calculator that costs $23. She has $65 to spend. Write and solve an equation to find how many notebooks she can buy.

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.

What is the sum of these mixed numbers 2 1/8 + 4 3/8

Which of these is and example of a literal equation? a) 6+30=6^2 b)3x-4y c)12=9+3x d)ax-by=k