Hannah can paint a room in 20 hours. destiny can paint the same room in 12 hours. how long does it take for both hannah and destiny to paint the room it they are working together.

Which of the following points is collinear with (-2,1) and (0,3)

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.

How do you solve a question like this?