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Alex777 [14]
3 years ago
11

A sphere and a cylinder have the same radius and height. The volume of the cylinder is 11 feet cubed

Mathematics
1 answer:
nikklg [1K]3 years ago
6 0

Answer:

Start with the formulas for the volumes of the sphere and cyl. respectively:

Vs = (4/3)*pi*r^3                        Vc = pi*r^2*h

Here, sphere and cyl. have the same radius and height.  Thus, the diam. of the sphere, d = 2r, has the same value as does h.

Thus, Vs = (4/3)*pi*r^3    and     Vc = pi*r^2*(2r) = 50.  Thus, pi*r^3 = 50, or

                                                                                                    r^3 = 50/pi

Then Vs = (4/3)(pi)*(50/pi) = 200/3 ft^3

Unfortunately, this doesn't agree with any of the answer choices, 'though it's close to given choice 100/3 ft^3, off by a factor of 2.

The trick here is to eliminate variables (especially the cyl. ht., h) and to make appropriate substitutions.

Step-by-step explanation:

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------------------

In summary, we found
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D = 22.2727

The value C = 39 is the largest of the four results. This value corresponded to (x,y) = (3,9)

Therefore the max value of z is z = 39 and it happens when (x,y) = (3,9)

------------------

Final Answer: 39

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