Your answer would be answer choice D. The ball is accelerating as the velocity is increasing at a constant rate.
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After 3 years, the substance will go through 4 half lives. You can do 230*(1/2)^4, which is 14.375.
Answer:

Explanation:
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In this case, since the percent water is computed by dividing the amount of water by the total mass of the hydrate; we infer we first need the molar mass of water and that of the hydrate as shown below:

Thus, the percent water is:

So we plug in to obtain:

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