The height of the cylinder shown in the diagram is two times its radius, r. what is the volume of the cylinder in terms of r?
a.
v = 4 r2
b.
v = 2 r3
c.
v = 2r3
d.
v = r3
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The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

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Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.