Lets try this again, I was told to post this here because it'sapparently too advanced for alg-precalc.
When sound waves travel through a solid, a liquid, or a gas, themolecules of the medium vibrate in the direction of the motion ofthe sound wave. The frequency, f, of a sound wave is measured innumber of vibrations in a second. The unit of measure is hertz. Onehertz (Hz) is one vibration per second. The human ear can hear arange of frequencies from about 20 Hz to about 20,000 Hz.Frequency, wavelength, C, and speed, v, of a sound wave are relatedby the formula, v = fC.
The price of soundproofing a room depends on the frequency of thesound. A contractor used this formula to quote a price to John tosoundproof a room: P = 2491.5f, where P represents the price. TheSmith home has 7 rooms How much will it cost Miguel to soundproofall the rooms in his home?
$ 1152.44
$1534.76
$2685.84
$1918.45