What is the formula for the area of a circle? A. A=(pi)r^2
B. A=(pi)r
C. A=(pi)^2r
D. A=(pi)d^2

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Step-by-step explanation:

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answer:

at time x=0 we have 1000, at time x=1 we have 2000, at time x=2 we have 4000.  

so that's an initial value of 1000 and a ratio of 2,

y = 1000 (2^x)

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