Find the lcd of the list of fractions -5/3,-7/15

The lcd is 15.

answer: for each 3 girls there is 2 boys . 3: 2

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the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

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