How do i round to the nearest 0.5 centimeters ?

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

The parabola opens: y=√x-4 (principal square root) up down right left

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online