Answer:
21600cm^3
Step-by-step explanation:
7200cm^3÷30cm=24cm
24cm×30cm×40cm
=21600cm^3
First term = T(1) is obtained by plugging n = 1 into the formula,
thus First term = 1^2 - 4 = 1 - 4
= 3 (answer)
1,2,5
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