So a 4 digit number is represented abcd, they are not multiplied together, each letter represents 1 single , whole number
if abcd times d=dcba
solve for the values of a and b and c and d with full workings and solution (this problem is from my 5th grade math book, just for fun)

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.