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howabouttomorrow
I'm not sure for #14 but I think I know the answer to #16: 

In the equation, h stands for the amount of hours: (4 x h) + 15

Does it make sense to you?
14. replace x with -4
f(-4) = 3(-4)^2+4(-4)-1
= 48-16-1
= 31

16. cost, C = 4h+15 [h represent hour]

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