1)Jorge recorded the number of customersythat came to his store over a number

of hoursx. Does the data represent a

quadratic function? Explain.

x1 3 5 7 9

y2 5 11 17 23

2) NASA has a plane that travels in a

parabola to simulate zero-gravity. Itspath can be modeled by the equationy8.6x2 560x24000 whereyis

the altitude in feet andxis the time

since it started the maneuver. What is

a reasonable domain for this function?

No; the second differences