Find the component form, magnitude, and direction angle of the resultant vector.

Determine -f-g where f=<0,12> and g=<1,3>

Let's get the slope of this line, making a triangle between points (0, 2.5) and (15, 7.5)

tg x = oc/ac

tg x = 5/15

tg x = 1/3

So, m = 1/3

(y - yo) = 1/3.(x - xo)

Now just put a point

(y - 2.5) = 1/3.(x - 0)

y - 5/2 = 1x/3

For 40 cars:

40 - 5/2 = x/3

75/2 = x/3

112,5 = x

Making an approximation we have 115 as ans, alt B.