Explanation:
we can model the expression for the inequality as
given the flat rate is $3
let the additional mile be x
hence
3+0.05x<10
step two:
let us proceed to solve for x
3+0.05x<10
0.05x<10-3
0.05x<7
divide both sides by 0.05
x<7/0.05
x<140
let us plug in 15 into the expression and see if the cost is under $10
3+0.05(15)<10
3+0.75<10
3.75<10
from the analysis, carl will have to take the taxi since cost is less than $10 i.e $3.75