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Whole problem, but just need help getting through the first one then maybe I'll understand it.

substitute for r = 4t in A(r) = pi r^2

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so A = pi (4t)^2

= 16 pi t^2

Ok, so after I do that I would times t^2? Or would I leave it alone and times it by 3.14?

thats the answer to Part A
for Part B plug in t = 4 into 16 pi t^2 and work it out.

Oh ok give me a moment

welshfella can u help me with a question?

16 pi (4)^2
16 pi (16)
16 (50.24)
803.84 This is what I got, not to sure if it's right or wrong.

was it right??

And yes it was sorry for missing your comment haven't been on

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