maths homework help

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1 total messages Started by Mark Soanes Thu, 26 Mar 1998 00:00

#62

Author: Mark Soanes
Date: Thu, 26 Mar 1998 00:00

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Could someone please help me with these problems.
Quangoland Postal Service will accept any letter for postage at 50 cents
provided that the sum of the length and width of the envelope is not more
than 40cm.
Maximillion Stationers is designing envelopes that will have the maximun
area that can be posted for 50 cents.
(a) Write an expression for the area, (A), of the envelope in terms of the
length, (L), and width, (W).
(b) (i) Write an equation linking L, W and 40cm.
      (ii) Rearrange this equation to make W the subject.
(c) Give an equation for A in terms of L.
 (d) What length and width should the envelope be to give maximun area?

marksoanes@clear.net.nz

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