Answer:

Step-by-step explanation:
The formula of a volume of a cylinder:

r - radius
H - height
We have r = 3in and H = 9in. Substitue:

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<span><u>Answer</u>
25c^2-4/9
<u>Explanation</u>
In this question you are expected to expand (5c+2/3)(5c-2/3)
(5c+2/3)(5c-2/3)=(5c×5c)-(5c×2/3)+(5c×2/3)-(2/3×2/3)
=25c^2-10c/3+10c/3-4/9
25c^2-4/9
The expanded form of (5c+2/3)(5c-2/3) is 25c^2-4/9 and this is what the question requires of you to do.</span>
It's 7.4 because the 3 doesn't round the 4 up.
Pic 1 is correct
Pic 2 is correct
Pic 3 is correct