Please help me with this question ❤️

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

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

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.