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slavikrds [6]
3 years ago
5

The speed of a river current is 7 mph. If a boat travels 20 miles downstream in the same time that it takes to travel 10 miles u

pstream find the speed of the boat in still water
Mathematics
1 answer:
dem82 [27]3 years ago
3 0

Answer:

  21 mph

Step-by-step explanation:

The relationship between time, speed, and distance is ...

  time = distance/speed

The speed downstream is b+7 if the boat's speed is b. The speed upstream is b-7, and the times in each direction are equal. This means ...

  20/(b+7) = 10/(b-7) . . . . . . time in each direction are the same

  20(b-7) = 10(b+7) . . . . . . . cross multiply

  (20-10)b = 7(10+20) . . . . . add 7(20)-10b

  b = 7(20 +10)/(20 -10) = 21 . . . . mph

The speed of the boat in still water is 21 mph.

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Answer:

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3 0
4 years ago
What is the solution of x-1/1-x &lt; 0?
kykrilka [37]

Option C is correct option.

Step-by-step explanation:

We need to find the solution of \frac{x-1}{1-x}

The given inequality becomes undefined when x = 1 because the denomiator is: 1-x and if x = 1 then it becomes 1-1 = 0 and anything divided by zero is undefined.

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So, Option C is correct because all numbers are included in number line except 1. An unfilled circle on 1 shows that it is not included in the solution. Rest of numbers are included.

Option C is correct option.

Keywords: Solving inequalities

Learn more about Solving inequalities at:

  • brainly.com/question/1465430
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  • brainly.com/question/11788572
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#learnwithBrainly

8 0
4 years ago
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WARRIOR [948]

Hey!

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<em>Your answer is B)192π units³</em>

Good luck and hope this helps! :)

7 0
3 years ago
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Answer:

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