A homeowner notices that the electric bill for the house is often much higher in the summer months. Collecting data from the last 18 monthly electric bills, the amount of each bill is plotted against the mean temperature for each month. The logs of both the mean monthly temperature and the electric bill are taken in order to develop a linear model. Based on the scatterplot and computer output, a reasonable estimate for the home’s electric bill when the mean monthly temperature is 76 degrees is:

$145.30 because y = 1.9313(76) − 1.4806 = 145.30
$8.60 because and e2.1518 = 8.60.
$141.85 because and 102.1518 = 141.85.
$4,923.97 because and 103.6923 = 4923.97.