Every evening jenna empties her pockets and puts her change in a jar. at the end of the week she counts her money. one week she had 40 coins, all of them
dimes and quarters when she added them she had a total of $7.75 let d= number of dimes and q = the number of quarters. how many quarters did she have?

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.