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andreyandreev [35.5K]
3 years ago
6

I need help.........

Mathematics
1 answer:
Otrada [13]3 years ago
3 0
The first would be 4,000 and the second would be 400
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4y-x=5+2y; 3x+7y=24 solve systen by using substitution
jek_recluse [69]
4y - x = 5 + 2y ..... (1)
3x + 7y = 24    ..... (2)

by grouping like terms in (1)
4y - x = 5 + 2y
4y - 2y - x = 5
<span>-x + 2y = 5 </span>        ..... (1a)

by multiplying (1a) through by -3
(-3)(-x) + 2(-3)y = 5(-3)
3x  -  6y = -15  ..... (1b)

by subtracting 1a from 2
3x -3x + 7y - (-6y) = 24 - (-15)
                      13y = 39
           ⇒            y = 3

by substituting y=3 into (2)
    3x + 7(3) = 24 
              3x = 24 - 21
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        ⇒     x = 1


∴ solution to the system is x=1 when y = 3
6 0
3 years ago
Please rewrite without absolute value for the given conditions:<br> y=|x-3|+|x+2|-|x-5|, if x &lt;-2
alex41 [277]

Answer:

y = |x-3| + |x+2| - |x-5|, if x <-2

y = |x-3| + |x+2| - |x-5|

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y = -x -6

4 0
3 years ago
Which is the best estimate for (8.9 x 10^8)/(3.3 x 10^4) written in scientific notation?
alexira [117]

Answer:

3*10^4

Step-by-step explanation:

8.9/3.3 is about 3. 10^8/10^4 is 10^4.

Thus, the answer is about 3*10^4.

6 0
3 years ago
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an auto repair shop charges $25 an hour they say your muffler needs to be replaced for $65 it takes them 2.5 hours to fix your c
Levart [38]

Answer: $130.50

Step-by-step explanation:

2.5 hours= $25 an hour

25+25+12.50=$62.50

Muffler=$65

65plus62.50

Total= $130.50

5 0
3 years ago
What is the distance between the two endpoints in the graph below? if necessary,round your answer to two decimal places
enyata [817]
The distance between the two endpoints is :

14.212 or about 14.21 ( rounded to the nearest hundredth)
5 0
3 years ago
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