A club elects a president, vice-president and secretary-treasurer. How many sets of officers are possible if there are 13 members and any member can be elected to each position? No person can hold more than one office. A. 286 B. 17,160 C. 572 D. 1,716​

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

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5/12, or 5: 12

step-by-step explanation:

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step-by-step explanation: