The speed of the current in a river is 6 mph. A ferry operator who works that part of the river is looking to
1 answer:
Answer:
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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x=(4y+15)/(5-3y)
Answer:30
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Answer:
w = - 15
Step-by-step explanation:
Assuming you mean
= - 4 ( multiply both sides by 3 to clear the fraction )
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Answer:
Step-by-step explanation:
F + 3pi = 7pi
F + 3pi - 3pi = 7pi - 3pi
Combine like terms (3pi + - 3pi = 0)
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