Multiply the following. Show your work to illustrate your understanding of the standard: a) 3x (7x+8)

b) (x-7) (x+4)

c) (x - 6)²

Find the sum of the following series. round to the nearest hundredth if necessary.

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.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?