Answer:
Total cost = $105
Step-by-step explanation:
The rental cost is represented by the function c(d)=25 + 20 d.
We need to find the cost of the bike if he uses the bike for 4 days.
Put d = 4 in the given expression.
c(4)=25 + 20 (4)
=25+80
=$105
So, the cost of the bike for 4 days is $105.