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PLEASE HELP: The area of a circle is given by A=πr^2, where r is the radius. If the radius of a circle is increased y 4 inches, the area of the resulting circle is 100π square inches. Find the radius of the original circle.

Mathematics
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This is what I did, but it's wrong. |dw:1354247106626:dw|
|dw:1354247301693:dw|
you just forgot the pi and it increased by for not multiplied by 4 so you only add 4

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Other answers:

|dw:1354247411483:dw|
so you squarroot everything and get r+4=10
am i supposed to divide it all?
yeah beacuse you have to do the same thing on each side like you subrtract numbers from each side
but if i divide everything, wouldn't everything cancel out besides 100?
nevermind i understand now
thanks

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