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andrey2020 [161]
3 years ago
6

I NEED HELP PLZ I WILL GIVE THANKS AND BRAINLIST

Mathematics
2 answers:
alexira [117]3 years ago
6 0
The mapping is not a function
sertanlavr [38]3 years ago
4 0
It’s a function, each number has a different number.
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3

Step-by-step explanation:

3x+3-x+3=12

3x-x=12-3-3

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A raft and a motorboat simultaneously leave from the same point and move down the river. After 2 hours the motorboat turns aroun
lesya692 [45]

Answer:

2 hours

Step-by-step explanation:

Let x mph be the speed of motorboat in still water and y mph be the speed of current.

A raft and a motorboat simultaneously leave from the same point and move down the river, then speeds down the river are:

        motorboat =  x + y mph

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In two hours they will cover:

        motorboat = 2(x+y) miles

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After 2 hours the motorboat turns around and starts moving towards the raft (against the current), so its speed is now x - y mph.

Let t be the time they move towards each other. In t hours, they cover

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The distance from the starting point to the turning point is the same as the sum of the distances the raft covers and the motorboat covers after turning around, so

2(x+y)=2y+t(x-y)+ty \\ \\2x+2y=2y+tx-ty+ty\\ \\2x=tx\\ \\t=2\ hours

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