How much co2 would be released per person per year

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

What is the quadric regression equation that fits these data

The amount cami raised during last year’s charity walk, $45.50, is 7/10 of the amount she raised this year. which equation represents n, the number of dollars she raised this year?