F(x) as a piecewise function would be:
f(x) = ($3/lb)x, for 0≤x≤10,
= ($1.50/lb)x, for (10,20], and
= ($0.50/lb)x, for (20,40]
To the above must be added $7.50, [0,10] or $12, (10,40]
Its b. Just draw it on graph paper. Its an easy estimate
So if you wanna know how long Marsha did you should multiply 1/10 by 5 so you will have: 5/10 which is equal to 1/2 mile :)))
i hope this is helpful
have a nice day
