Answer:
F. $1.50 per mile
Explanation:
In order to solve this, you can first change it to slope-intercept form to find the slope, or rate of change, easier:
y = 3.75 + 1.5(x - 1) (given)
y = 3.75 + 1.5x - 1.5 (multiply 1.5 by each term in the parenthesis)
y = 2.25 + 1.5x (subtract 1.5 from 2.25)
y = 1.5x + 2.25 (order the terms by exponent value)
In slope-intercept form, the m (slope) of this equation is 1.5, so the rate of change is $1.50 per mile (with an initial fee of $2.25).