What is the measure of ∠ a in this quadrilateral?

Ihave trouble finding the nth term of a linear sequence

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

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.