Please show your work... How do you do this?
A taxicab charges $.90 for the first 1/5 mile and $.60 for each additional 1/5 mile. If a customer rides in this cab for m miles (m>1/5) , which of the following functions descibes the cost,c(m), of this tax ride in dollars?
First 1/5 mile=$0.90
cost of m miles=$0.90+[(m-1/5)x$0.60]
=$0.90+[0.60m-0.12]
=$(0.78+0.6m)