Consider the quadratic function that has x-intercepts of–1 and –7 and passes through the point (-2,-20). What is the value of a in the factored form of this function?
1, 2,3,4?

Precalculus question, image attached.

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.

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.