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Mathematics 8 Online
OpenStudy (anonymous):

bye

OpenStudy (phi):

a cone-shaped cup 23 cubic inches those are clues we are talking about volume. Do you have a formula for finding the volume of a cone ?

OpenStudy (phi):

ok. now in your formula which "parts" do we know? any ideas (based on what is in the question) ?

OpenStudy (phi):

ok r=1 let's not worry about how to use it (yet). next, do we know V or h ?

OpenStudy (phi):

ok r=1 V=23 V= 1/3 * pi * r^2 * h (I put in * to show the multiplies, usually we don't bother) replace V with 23 replace r with 1 by the way r^2 means \( r^2= r\cdot r\)

OpenStudy (phi):

also, 3.14 for pi, so we should also replace pi with 3.14

OpenStudy (phi):

too many things off with that. Start with the formula V= 1/3 * pi * r^2 * h erase the V, put in 23. erase "pi", put in 3.14 erase the r, put in 1 only that, nothing else. what do you get ?

OpenStudy (phi):

we don't expect a number yet. we want the formula with V, pi and r replaced with numbers. can you do that ?

OpenStudy (phi):

can you simplify 1/3 * 3.14 ?

OpenStudy (phi):

you get 1/3 * 3.14 = (about) 1.0467) so 23= 1.0467 h to solve for h , divide both sides by that number what do you get ?

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