Tiffany collects perfume bottles. she has 99 bottles in her collection. two-thirds of her perfume bottles are made of crystal. how many of the perfume bottles are made of crystals?

c is the correct answer

step-by-step explanation:

it has to have an angle of 90 degrees

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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