Which property is shown 12+(8+5)=(12+8)+5

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.

An equation where variables are used to represent known values—function notation true or false

Evaluate the expression for the given value of the variable 7a - 4a for a =8