SOLUTION: A certain kind of animal weighs about 77 pounds at birth and gains about two pounds per day for the first few weeks. Determine the days for which the animal's weight is more than 1

Question 253238: A certain kind of animal weighs about 77 pounds at birth and gains about two pounds per day for the first few weeks. Determine the days for which the animal's weight is more than 129 pounds.
Found 3 solutions by stanbon, drk, edjones:
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
A certain kind of animal weighs about 77 pounds at birth and gains about two pounds per day for the first few weeks. Determine the days for which the animal's weight is more than 129 pounds.
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W(t) = W(0)+2t
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129 < 77 + 2t
---
2t > 129-77
2t > 52
t > 26 days
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Cheers,
Stan H.

Answer by drk(1908)   (Show Source): You can put this solution on YOUR website!
Animal starts at 77 and gains 2 pounds per week. Let W = number of weeks and A = animal weight. We get an equation of:
A = 2W + 77
we want Animal weight > 129, so, we get

step 1 - subtract 77 to get

divide by 2 to get

after 27 weeks, the animal will weigh more than 126 pounds.
Answer by edjones(8007)   (Show Source): You can put this solution on YOUR website!
let d=number of days.
77+2d>129
2d>52
d>26
.
Ed
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