In one month american's consumed 320,500,000 gallons of gasoline. express this number in scientific notation.
a) .3205 x 109
b) 3.205 x 108
c) 3.205 x 10-8
d) 32.05 x 107

F(x) = (x^2 + 3x − 4) and g (x) = (x+4) find f/g and state the domain.

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

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.