The first composite shape<span> is a combination of a rectangular prism and a pyramid. To </span>find the volume <span>of the entire </span>shape<span> you </span>find the volume<span> of each individual </span>shape<span> and add them together. The second </span>figure<span> consists of a cylinder and a hemisphere.</span>
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So you basically add the amount it grew each week. So week one is 2 and 1/2, week two is 2 and 3/4 and week three is 3 and 1/4. to make things simpler, add week two and three which gets you 6inches, then add week one, to get 8 and a half inches.
I don’t really understand what you have said. But I need help on my homework.