Volunteers at sam's school use some of the student council's savings for a special project. they buy 5 backpacks for $6 each and fill each backpack with paper and pens that cost $4. by how much did the student council's savings change because of this project?

Which matrix multiplication is possible?

Can someone me with this problem i don't understand i need

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.