Evan is making shelves out of the 12 ft section of wood in his garage. his shelves need to be 1.6 ft long. how many shelves can he make?

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

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.

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?