Twice a number decreased by 15 is equal to -27 . what is the number ?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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.

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq