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bonufazy [111]
4 years ago
5

a boat can travel 30 miles upstream in the same amount of time you can travel 50 miles Downstream. If the speed of the current i

s 4 miles per hour, find the speed of the boat in still water.
Mathematics
2 answers:
almond37 [142]4 years ago
7 0
Speed, S = Distance (d) / Time (t) => S= d/t => t= d/S

Let the speed of boat in still water be x mph

Resulting speed upstream = x-4 mph for a distance of 30 miles
Resulting speed downstream = x-4 mph for a distance of 50 miles

Time taken in both distances is equal.
Therefore,

30/(x-4) = 50/(x+4) => 30(x+4) = 50(x-4) => 30x+120 = 50x-200 => 120+200 = (50-30)x => 20x = 320 => x=320/20 = 16 mph

The speed of boat in still water is 16 mph.


MA_775_DIABLO [31]4 years ago
6 0
The correct answer is 16mph.
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Finger [1]

Answer:

The answer is option C

Step-by-step explanation:

f(x) = x³ + 2x² + 3x + 4

To find f(-1) substitute the value of x that's

- 1 into f(x)

That's

<h3>f( - 1) =  ({ - 1})^{3}  + 2 ({ - 1})^{2}  + 3( - 1) + 4 \\  =  - 1 + 2(1)  - 3 + 4 \\  =  - 1 + 2 - 3 + 4 \\  = 1 - 3 + 4</h3>

We have the final answer as

<h3>f( - 1) = 2</h3>

Hope this helps you

8 0
3 years ago
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mash [69]

Answer:

There are 36 total possible outcomes.

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Rolling a sum of 9, there are 4 possibilities, which is a better chance.

Rolling a sum less than 5, there is 6 possibilities, which is a better chance.

Rolling greater than 5 but less than 7 means rolling a sum of 6, there are 5 chances, which is a better chance.

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The answers would be:

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5 0
3 years ago
Read 2 more answers
What is 3x-10 less than 2
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3 0
3 years ago
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3 years ago
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Travka [436]

Answer:

a) 4x - 8y

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Step-by-step explanation:

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multiply 6x and -12y by (1/3)

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add together the like terms

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3 0
3 years ago
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