The decibel level for the intensity of a sound is a logarithmic scale defined by D = 10 log, (/) + 120, where / is the intensity of the sound in watts per square meter. Express I as a function of D. (Express numbers in exact form. Use symbolic notation and fractions where needed.) I( D) When D increases by 25, the intensity increases by what factor? (Use decimal notation. Give your answer to one decimal place.) intensity increases by