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Reptile [31]
3 years ago
10

It takes a boat going upstream 11 hours to cover the same distance as it would cover in 9 hours going downstream. What is the sp

eed of the boat if the speed of the current is 2 kilometers per hour?
Mathematics
1 answer:
Musya8 [376]3 years ago
7 0

Answer:

  20 km/h

Step-by-step explanation:

Let b represent the speed of the boat in km/h. Then the distance covered is ...

  distance = speed × time

  (b -2)(11) = (b +2)(9)

  11b -22 = 9b +18 . . eliminate parentheses

  2b = 40 . . . . . . . . add 22-9b

  b = 20 . . . . . . . . . divide by 2

The speed of the boat is 20 km/h.

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Answer:

A. 56-6m<20

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13. Less than, greater than, going over or not going over.

Step-by-step explanation:

A. The answer to the first question can be simple. If she can scan 6 photographs per minute, then we would write the inequality 56-6m<20, since we are subtracting 6 from 56 every minute, we would write 6 per minute as 6m, and subtract that from 56. Lastly, since it says <u>less than</u>, we need to put the less than symbol, the mouth facing towards the 20 as the greater number.

B.  If she has spent 28, that means that we put -28 on the equation as a constant. Then, we put the price times the number of batteries she bought, or 2.95b, and put a less than symbol, since we want to spend less than the 450 gift card. So the equation would be 2.95b+28<450

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Hope this helps! :D

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Answer:

This question is incomplete.

Step-by-step explanation:

Where are the list of equivalent values?

One list might be 98+1414+918 (because there are  7 14's either side of the 1414.)

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