The number of years a truck is owned, x, and the cost of annual repairs in dollars, f(x) , can be modeled by a linear function. f(x)=−110.2x+740.8 after how many years would the cost of repairs be $300?
a.3
b.4
c.5
d.6

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth