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S_A_V [24]
3 years ago
15

Evaluate the expression 5c-2 for c=5

Mathematics
1 answer:
Setler [38]3 years ago
6 0
<h3>Answer:  23</h3>

Explanation:

Replace c with 5. Use PEMDAS to simplify

5c - 2 = 5*5 - 2 = 25 - 2 = 23

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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)

7 0
3 years ago
A video has 42 thumbs down. What integer represents its score in points?
ioda

Answer:

Step-by-step explanation: it is negative 42 it is just the opposite cause the thumbs is down negative up positive

6 0
3 years ago
The ratio of the mass of an ant to the mass it can carry 1:50
slavikrds [6]

The ratio 1:50 means that an ant can carry an object heavy 50 times its mass.

So, if the mass of the ant is 0.4 grams, it can carry at most 50 times that mass, i.e. 50x0.4 = 20 grams

In order to answer the second question, you need to consider your mass and multiply it by 50: if you were as strong as an ant, you could lift that weight!

6 0
3 years ago
There are 11 kids at a birthday party. If there are 6 girls and 5 boys at the party, whta fractof the kids are boys?
svetoff [14.1K]

Answer:

Step-by-step explanation: The answer is 5/11.



8 0
2 years ago
Read 2 more answers
An event has probability of 3/4.<br> How would you best describe<br> the likehood of this event?
tekilochka [14]

Answer:

more likely

Step-by-step explanation:

3/4 is 0.75 or 75%. I would describe it as likely.

elimination-

3/4 is not equal to 1 or 0.5 or 0. It is also not equal to 0.25

5 0
2 years ago
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