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Lorico [155]
3 years ago
15

the length of a rectangle is 39cm less than five times its width. find the dimensions if the perimeter is 414cm. 2L+2W = P

Mathematics
1 answer:
Oksanka [162]3 years ago
4 0

Answer:

  • 41 cm and 166 cm

Step-by-step explanation:

<u>As per question we have:</u>

  • 2(l + w) = 414 ⇒ l + w = 207
  • l = 5w - 39

<u>Solve it for l by substitution:</u>

  • 5w - 39 + w = 207
  • 6w = 207 + 39
  • 6w = 246
  • w = 246/6
  • w = 41

<u>Find l:</u>

  • l = 207 - 41 = 166
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Answer:

The number of distinct arrangements is <em>12600</em><em>.</em>

Step-by-step explanation:

This is a permutation type of question and therefore the number of distinguishable permutations is:

n!/(n₁! n₂! n₃! ... nₓ!)

where

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Therefore,

<em>Number of distinct arrangements =  10!/(4! × 3! × 2! × 1!)</em>

<em>                                                         = </em><em>12600 ways</em>

<em />

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3 years ago
Please help me. I need help
mel-nik [20]
<h3>Answer:</h3>

  a.  -(3√13)/13

<h3>Step-by-step explanation:</h3>

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Then ...

  cos(θ) = ±1/√(tan(θ)² +1)

The <em>cosine is negative in the second quadrant</em>, so we will choose that sign.

  cos(θ) = -1/√((-2/3)² +1) = -1/√(4/9 +1) = -1/√(13/9)

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3 years ago
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B

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