Parent volunteers at Wildgrove High School are processing yearbook order forms. Students have an option to get the basic yearbook or a deluxe option, which includes engraving and a protective cover. In Mrs. Whitehead's class, 23 basic yearbooks and 30 deluxe yearbooks were ordered, for a total of $4,091. The students in Mr. Copeland's class ordered 19 basic yearbooks and 21 deluxe yearbooks, for a total of $3,058. How much does each option cost?

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.