Which pair of complex numbers has a real-number product?
(1 + 3)(61)
(1 + 31)(2-31)
(1 + 31)(1 – 3)
(1 + 3)(31)

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.

Are the corresponding angles congruent? explain why or why not.

Factor and solve to find roots x squared -x - 90 =0