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elena-s [515]
2 years ago
8

1. Use trigonometry to work out the value of x. Not drawn accurately. Help pls

Mathematics
1 answer:
tino4ka555 [31]2 years ago
8 0

Answer:

20cos(39) or  15.543 (3 d.p.)

Step-by-step explanation:

  • Use SOHCAHTOA
  • You want to find A and have an angle of 36° and H
  • So use CAH
  • cos(39) = x / 20
  • x = 20cos(39)
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A sample of radium has a weight of 1.5 mg and a half-life of approximately 6 years.
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Answer:

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Step-by-step explanation:

From the question given above the following data were obtained:

Original amount (N₀) = 1.5 mg

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Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

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