6n - 5 is the answer
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Answer:
Step-by-step explanation:
we can see that
upper part is cone
bottom part is cylinder
Volume of cone:
we are given


now, we can use volume formula

now, we can plug values
and we get


Volume of cylinder:
we are given


now, we can use volume formula

now, we can plug values
and we get


now, we can add both volumes

we get
..............Answer