neone good in calculus??
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pls math genius here..help to solve the probs
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~edited~
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*paging for CoolMyth*
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wats this? 5th form calculus?
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No offence intended...but what's 'neone'?
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Can't help. I know basic calculus nia. Ask me applications I am gone case.
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Currently having a look.Originally posted by alfagal:*paging for CoolMyth*
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Ermm, may I ask one question?
What school are you from? Is it a Singapore school? We don't use feet, but metres or centimetres.
Don't even understand what the question means. -
1st one:
volume = 32 = x * x * h
therefore h = 32/x^2
surface area = A = x^2 + hx + hx + hx + hx + x2 = 2x^2 + 4hx
using h = 32/x^2 to subst into A = 2x^2 +4h
differentiate dA/dx and equate to zero.. solve..
to check, get d2A/dx2 to see if it is minimum or maximum
that's it... -
'n'-'e'-one..... anyone....Originally posted by Kuali Baba:No offence intended...but what's 'neone'? -
oh its in british lingo ..not singapolish...
so neone? i have forgotten all da maths i learned in skool...except for counting money -
What is meant by
(a) determine objective and constraint equations?
(b) express the quantity to be minimized as a function of x?
(c) find the optimum value of x and h? -
Q2:
Let t be the increase/decrease in toll charge needed in cents.
Let S be the toll charge received daily.
Hence, the equation is:
S = (36,000 - 300t)(t + 100) (since when t = 0, toll charge will be $1 or 100 cents)
Hence simplify,
S = 6,000t - 300t^2 + 3,600,000
dS/dt = 6,000 - 600t
When dS/dt = 0
t = 10
Check, d^2S/dt^2 = - 600 S will be at a maximum.
Hence, required toll charge = 100 + 10 cents = $1.10. -
can u solve question 1? complete with the answer?Originally posted by CoolMyth:Q2:
Let t be the increase/decrease in toll charge needed in cents.
Let S be the toll charge received daily.
Hence, the equation is:
S = (36,000 - 300t)(t + 100) (since when t = 0, toll charge will be $1 or 100 cents)
Hence simplify,
S = 6,000t - 300t^2 + 3,600,000
dS/dt = 6,000 - 600t
When dS/dt = 0 t = 10
Check, d^2S/dt^2 = - 600 S will be at a maximum.
Hence, required toll charge = 100 + 10 cents = $1.10.
u from raffles is it -
wrong la .. the box has only five sides .. the top is open.Originally posted by the Bear:1st one:
volume = 32 = x * x * h
therefore h = 32/x^2
surface area = A = x^2 + hx + hx + hx + hx + x2 = 2x^2 + 4hx
using h = 32/x^2 to subst into A = 2x^2 +4h
differentiate dA/dx and equate to zero.. solve..
to check, get d2A/dx2 to see if it is minimum or maximum
that's it... -
the Bear got the general crux of Q1, so I dun think need me to fill in details.Originally posted by valentinoo:can u solve question 1? complete with the answer?
u from raffles is it
Me raffles? No. 
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wht boout Q 3?
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Currently taking a look.Originally posted by valentinoo:wht boout Q 3? -
then 3hx lahOriginally posted by Icemoon:wrong la .. the box has only five sides .. the top is open.
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worse!Originally posted by the Bear:then 3hx lah -
Paiseh, after thinking through Q3, not sure what the question is asking. Got some ideas but not very sure.
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oops..
never say which side open
okay okay... 4hx + x^2Originally posted by Icemoon:worse! -
you ask me this 4 years ago i can answer for you. haha
Last time in uni got take this course.
But you must thank NS, my brain degenerated since.
Anyway, you can ask business students.. this seems to be questions for them.
It's business economics.
for now.. let me try figure question 3. -
er...wad level r u?
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i read da question..i also catch no ballsOriginally posted by Ponders:you ask me this 4 years ago i can answer for you. haha
Last time in uni got take this course.
But you must thank NS, my brain degenerated since.
Anyway, you can ask business students.. this seems to be questions for them.
It's business economics.
for now.. let me try figure question 3.