Aphon company charges a $45 monthly fee for 500 minutes of phone use. for each minute over 500, the phone company charges an additional $0.08. which equation can be used to determine the tota amount the company charges, t for a phone call that is m minutes long l, where m is great than 500 a. t=0.08+44 b. t = 45-0.08(m-500) c. t = 0.08(m-500) + 45 d. t= 0.08(m+500) +45

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The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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.