a notepad, a stapler, and a pencil case cost $11.40 all together. The notepad cost $1.50 less than the stapler. The pencil case costs $2.50 more than the stapler. How much did the pencil case 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.