Ascientist counts 25 bacteria present in a culture and finds that the number of bacteria tripled each hour. the function y=25•3^x models the number of bacteria after x hours. estimate when there will be about 1170 bacteria in the culture.

a. about 3.5 hours
b. about 5.5 hours
c. about 2.5 hours
d. about 4.5 hours

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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.

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar