One side of a rectangle is 3 inches shorter than the other side, and the perimeter is 54inches. What are the dimensions of the rectangle? Which of the following could be used to solve the problem?

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.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Let x = a + bi and y = c + di and z = f + gi. which statements are true?