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**1. Homework Statement**

The weight, W kg, of a giraffe over its first two years of life, is given by the equation

W=(t^2)/4-t+68

where t is the time in months since the giraffe was born.

How long does it take the giraffe to weigh 85 kg?

**2. Homework Equations**

**3. The Attempt at a Solution**

I know i need to rearage the equation but i cant remember how so any help is appreciated...

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