PLEASE HELP. I DONT UNDERSTAND. The function f(x)=-5x^2+17x+21 models the predicted sales of a pen after x price increases. Use the table showing actual and predicted sales to find the residuals for the model.

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part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

for every hour i deducted .5 inches from the length of the candle

part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation:

can you put the picture up?

step-by-step explanation:

where is the diagram? shown below where? ?

step-by-step explanation: