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3 years ago

-x -20 = 4x - 5

Mathematics

2 answers:

melomori [17]3 years ago

6 0

Answer:

x=-3

Step-by-step explanation:

-x-20=4x-5

-20=5x-5

-15=5x

x=-3

Arlecino [84]3 years ago

3 0

Answer:-

-3

Step-by-step explanation:

-x - 20 = 4x - 5 -> -20 = 5x - 5 -> -15 = 5x -> x = -3

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3 years ago

Solve for A<br> Exact (no rounding, no calculator needed)<br><br> 0 = A^2 + 13A + 36

marysya [2.9K]

Answer:

-4 or -9

Step-by-step explanation:

-a^2-13a-36=0

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3 years ago

9mph in still water it takes 5hrs longer to travel 74 miles upstream than downstream find the rate of current and round to neare

prohojiy [21]

Answer:

The rate of current is 2.5 mph.

Step-by-step explanation:

The speed in the water when current is absent is 9 mph.

If the speed of the current is v mph then the upstream speed is (9 - v) mph and the downstream speed is (9 + v) mph.

Now, it takes 5 hours longer to travel 74 miles upstream than down stream, then we can write the equation as

$\frac{74}{9 - v} - \frac{74}{9 + v} = 5$

⇒ $\frac{2v}{81 - v^{2} } = \frac{5}{74}$

⇒ 148v = 405 - 5v²

⇒ 5v² + 148v - 405 = 0

Applying Sridhar Acharya's formula we can write

$v = \frac{-148 + \sqrt{148^{2} - 4(5)(-405) } }{2(5)}$ (Neglecting the negative root)

⇒ $v = \frac{- 148 + 173.2166}{10} = 2.5$ mph (Rounded to the nearest 10th) (Answer)

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4 years ago

Please help!!!!!!!!!!!!!!

Vlad1618 [11]

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3 years ago

PLEASE HELP, 20 POINTS

iragen [17]

Answer:

Step-by-step explanation:

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3 years ago