10. Emily and Andy each go to a hardware store to buy wire. The table shows the relationship between the cost and the length of wire.
a. Emily needs 24 feet of wire. How much will she spend on wire?
b. Andy needs 13 yards of wire. How much will he spend on wire?

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function. a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.