a store sells tiles for $3.80 per square feet and an additional fee is $200 to install it what is the independent and dependent variable?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Can someone me out here number 4 plz

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.