Answer:
10 minutes
Explanation:
You want to know the time it takes for a wood pile to have 45 sticks if 7 are added and 3 are removed each minute, and the pile started with 5 sticks.
Setup
The number of sticks in the woodpile, y, can be modeled in terms of t minutes as ...
y = 5 +7t -3t
Solution
We want to find the value of t that makes y = 45:
45 = 5 +4t
40 = 4t
10 = t
The woodpile will contain 45 sticks after 10 minutes.
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