Choose the best definition for the following phrase: like terms
a) a letter that holds the place for some unknown value in mathematics.
b) a process where you must look for terms that have identical variable parts and then combine their coefficients.
c) a process where if two things are equal, one can be put in the place of the other and nothing will change.
d) terms that have identical variable parts.

Which graph represents 2x-5y< 15

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.

Abook store is having a 30 perscent off sale. diary of the wimpy kid books are now 6.30 dollars each what was the original price of the books