SOLUTION: I need help on the following problem. Mr. Ken's class is collecting water bottles. They started with 17 on day one. On day 3, they had 30 water bottles. On day 5, they had 47 wa

Question 903185: I need help on the following problem.
Mr. Ken's class is collecting water bottles. They started with 17 on day one. On day 3, they had 30 water bottles. On day 5, they had 47 water bottles. how many water bottles did they have on day 2 and on day 4? how many water bottles will there be on day 7?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x,y
1,17
3,30
5,47
17=1*a+1*b+c,
30=9*a+3*b+c,
47=25*a+5*b+c
solve for a,b and c
y=0.5x^2+4.5x+12
(2,23)
x=2 y=23
(4,38)
x=4 y=38
(7,68)
x=7 y=68

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