A faucet can fill a bathtub in 6 minutes. The drain can empty the tub in 10 minutes. if both the faucet in the drain are open at the same time, this situation is represented by this expression, where T is the number of minutes it will take to completely fill the bathtub.
which expression can also represent the situation
A. t / 15
B. 4t / 15
C. t^2 / 60
D. t+60 / 60

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.