Help please I need help I can't do this alone

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?

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.