What are some real world examples of like terms?

For the equations below which statement is true ? -2x=14 6x=-42

27 is what percent of 108? 27 is % of 108

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed