Set up a proportion and solve the following! Two out of five students in the ninth grade have braces. If there are 325 students in the ninth grade, how many have braces?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.

A50-foot ladder is leaning against a vertical wall. if the base of the ladder is 45 feet from the base of the wall, find the angle the bottling of the ladder makes with the ground.