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WINSTONCH [101]
3 years ago
12

Twice a certain number is 58. Four times that number will be A.4 X 58 B.58 + 4 C.58 X 2 D.8 X 58

Mathematics
2 answers:
LUCKY_DIMON [66]3 years ago
6 0

Answer:

\boxed {8 \times 58}

Answer D is correct

Step-by-step explanation:

<em>Twice</em><em> </em><em>a</em><em> </em><em>certain</em><em> </em><em>number</em><em> </em><em>is</em><em> </em><em>5</em><em>8</em>

<em>\red {2 \times 58}</em>

<em>Four</em><em> </em><em>times</em><em> </em><em>that</em><em> </em><em>number</em><em> </em><em>will</em><em> </em><em>be</em>

<em>\green{ 2\times 58 \times 4 }\\  = 8 \times 58</em>

S_A_V [24]3 years ago
5 0

Answer:

The answer you are looking for is 8 time 58 or D

Step-by-step explanation:

Hope this helped

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Explanation:

1) <span>The City of New Orleans leaves Union Station in Chicago at 6:00 am and travels south to New Orleans. The train travels the 930.0 miles to New Orleans at an average speed of 79.0 miles per hour.

Scheme:


 →to south                                                    ←to north
                |----------------------|---------------------|
               A          x             X      930.0 - x    B
            6:00 am                                          6:00 am
           →                                                      ←
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=> x = 79.0 mi/h * t

2) at the same time the City of Chicago leaves New Orleans and travels north to Nhicago. The train travels the 930.0 miles to Chicago at an average speed of 81.1 miles per hour.

930.0 - x = 81.1 mi/h * t

3) How many miles south of chicago do the two trains pass each other?

Divide the two equations:

930.0 - x         81.1*t
------------- =   ----------
      x                 79*t

t cancels out =>

930.0 - x         81.1
------------- =   --------
     x                 79.0

Solve:

81.1x = 79.0(930.0 - x)

81.1x = 79.0 * 930.0 - 79.0x

81.1x + 79.0x = 73,470

=> 160.1x = 73,470

=> x = 73,470 / 160.1

=> x = 460.6 mi

4) Answer 460.6 miles South of Chicago.
</span>
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