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8x + √1 - √9y - √9x^2

5x + 3√y + 1

5x - 3√y - 1

5x - 3√y + 1

Last one: 5x - 3√y + 1

Step-by-step explanation:

8x + √1 - √9y - √9x^2

8x + 1 - 3√y - 3x

5x + 1 - 3√y

5x - 3√y + 1

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the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64