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zzz [600]
3 years ago
6

Need help please...answer correctly ​

Mathematics
2 answers:
charle [14.2K]3 years ago
8 0

<u>Answer with step-by-step explanation:</u>

a) Assuming x to be the speed of the boat and y to be the speed of the water, we can write an expression for:

- the distance traveled downstream: 3(x+y)

- the distance traveled upstream: 3.6(x-y)

b) setting expressions in part a equal to each other:

3(x+y) = 3.6(x-y)

3x +3y = 3.6x - 3.6y

3y + 3.6y = 3.6x - 3x

6.6y = 0.6x

y = 0.6/6.6x

y = 1/11x

c) 1/11 * 100 = 9.1%

Lelechka [254]3 years ago
3 0

Answer:

9.09

Step-by-step explanation:

x=speed of boat

y=speed of water current

Downstream relative speed = x+y

Upstream relative speed = x-y

Distance remains the same for both upstream and downstream.

a) Distance travelled downstream = speed x time = 3(x+y)

Distance travelled upstream = speed x time = 3.6(x-y)

b) Since both distances are equal, we can write

3(x+y)= 3.6(x-y)

3x+3y = 3.6x-3.6y

6.6y = 0,6x

x=11y: y=x/11

c) Water current has speed as 1/11 times of that of boat

In percent this equals 100/11 = 9.09%

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Answer:

The cost of posting one letter = £1.68

Step-by-step explanation:

Total amount Amina has = £20

Amina's change = £14.96

Total cost spent on posting the letters = £20 - £14.96 = £5.04

And we're told that she posts 3 letters in total, with the cost of posting each letter the same.

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Hence, the cost of posting a letter = £1.68

Hope this Helps!!!

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Hello!


The length of side BC can be found by using the Law of Sines. This law states,

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Given:

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Side BC (or A) = ? cm


Let's plug in these values into the formula to find the missing side length.


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