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Volgvan
2 years ago
14

The speed of the current in a river is 6 mph. A ferry operator who works that part of the river is looking to

Mathematics
1 answer:
Morgarella [4.7K]2 years ago
7 0

Answer:

  • 9 mph

Step-by-step explanation:

Let he speed of the boat on the lake is x.

<u>Considering the speed of the current it will take him:</u>

  • 22.5/(x + 6) + 22.5/(x - 6) = 9
  • 2.5 / (x  + 6) + 2.5 / (x - 6) = 1
  • 2.5(x - 6 + x + 6) = (x + 6)(x - 6)
  • 2.5*2x = x² - 36
  • x² - 5x - 36 = 0
  • x = (5 ± √(5² + 4*36))/2 = (5 ± 13) / 2
  • x = (5 + 13)/2 = 9 mph (negative root is discarded as the speed should be positive)
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PLEASE HELP WILL MARK BRAINLIEST
Anni [7]

Answer:

431,707

Step-by-step explanation:

To figure out the total number, you need to divide the part of the whole by the percentage it is of the whole.  This means that you need to divide 35,400 by 8.2%.

Before dividing the percentage, you need to convert it to a decimal.

8.2% = 0.082

Divide the number to find the answer.

35,400/0.082 = 431,707.3

Converted to the nearest whole number, the answer is 431,707.

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3 years ago
Writing a geometry proof seems to take a very specific kind of skill along with a specialized vocabulary. Yet you have also seen
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3 0
2 years ago
To form 3 adjacent squares (as in the figure), 10 toothpicks are required. How many toothpicks are required to form 100 adjacent
Sonja [21]
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3 years ago
-|-5| Is the answer greater than, less than, or equal to -5
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Step-by-step explanation:


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3 years ago
Please help,
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