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Tresset [83]
3 years ago
12

Rewrite each series using sigma notation 405+406+407+408+409

Mathematics
1 answer:
wlad13 [49]3 years ago
7 0
405+406+407+408+409=\boxed{\sum\limits_{n=405}^{409}n}
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The sides of a triangle are 1, x, and x2. what are possible values of x?
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The sides of the triangle are given as 1, x, and x².

The principle of triangle inequality requires that the sum of the lengths of any two sides should be equal to, or greater than the third side.

Consider 3 cases
Case (a):  x < 1,
      Then in decreasing size, the lengths are 1, x, and x².
      We require that x² + x ≥ 1
      Solve x² + x - 1 = 
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Case (b): x = 1
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Case (c): x>1
  In increasing order, the lengths are 1, x, and x².
  We require that x + 1 ≥ x²
  Solve x² - x - 1 = 0
  x = 0.5[1 +/- √(1+4)] = 1.6118 or -0.618
  Reject the negative answr.
 The lengths are 1, 1.618 and 2.618.

Answer:
The possible lengths of the sides are
(a) 0.382, 0.618 and 1
(b) 1, 1 and 1.
(c) 2.618, 1.618 and 1.

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D

Step-by-step explanation:

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