I believe the answer is 1. One is the only number that can go into both 8 and 9.
All you need to do is find the volume of those number
Y = mx + b
slope(m) = -3
(2,7)...x = 7 and y = 2
now we sub and fund b, the y int
2 = -3(7) + b
2 = -21 + b
2 + 21 = b
23 = b <== ur y int
The answer is 4 because 1 6/8 + 2 3/8 =4 1/8 so it would round to 4
Answer: $0.35 which is the same as 35 cents
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Work Shown:
3 cookies = $1.05
3/3 cookies = $1.05/3
1 cookie = $0.35 = 35 cents