F(x) birim fonksiyon olduğuna göre f(2)+2f(5) kaçtır?​

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

How to do this , and can some one explain

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles