Which property of real numbers is illustrated by the equation-2.5+2.5=0

The scatter plot graph shows the average annual income for a certain profession based on the number of years of experience which of the following is most likely to be the equation of the trend line for this set of data? a. i=5350e +37100 b. i=5350e-37100 c. i=5350e d. e=5350e+37100

Tom drove 206 miles in 3.9 hours. estimate his average speed.

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2