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Question:

I'm stuck on math questions?

My teacher never explained how to do these problems in our class and he expects it to be done tomorrow. Please some help me with these two questions, I'm at a lost.1) A grain silo consists of cylindrical main section and a hemispherical roof. If the total volume of the silo (including the part inside the roof section) is 15,000 ft^3 and the cylindrical part is 30 ft tall, what is the radius of the silo, correct to the nearest tenth of a foot?2) A box with a square base has length plus firth of 108 in. What is the length of its volume in 2200 in^3?

Answer:

this may well be a substitution problem. sparkling up X + 3Y = sixteen X = sixteen - 3Y now substitute that into the different equation: 4X + 7Y = 39 4(sixteen - 3Y) + 7Y = 39 sixty 4 - 12Y + 7Y = 39 sixty 4 - 5Y = 39 25 - 5Y = 0 25 = 5Y Y = 5 considering the fact that Y = 5, then X could equivalent sixteen - 3Y = sixteen - 3(5) = sixteen - 15 = a million X = a million
I hope you're meant to do this by calculator, because solving a cubic looks like this: www.math.vanderbilt.edu/~schectex... TI-83 et al. have a solve button - check your calculator's manual for instructions on using it. 1) Volume of a cylinder = π r^2 h Volume of a sphere = 4/3 π r^3 Note that because the cylinder meets the hemisphere at a great circle, they have the same radius. Total volume of the silo = 2/3 π r^3 + π r^2 h 15,000 = 2/3 π r^3 + 30 π r^2 r^3 + 45r^2 - 22500/π = 0 2) too many typos. firth = height? x + y = 108 x^2 y = 2200 x^2(108 - x) = 2200 0 = x^3 - 108 x^2 + 2200

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