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Brrunno [24]
3 years ago
7

X + y = 155x - y = 9Elimination method (4, ? )what number is the ?​

Mathematics
2 answers:
mixer [17]3 years ago
8 0
4 + y = 15....1
20 - y = 9.....2

....1*5
20 + 5y = 75....3

....3 - .....2
4y = 60
y = 15

the answer for (?) is 15
i’m not sure if this 100% correct but i’m trying my best to help you
vovangra [49]3 years ago
4 0
The ? Is 11.


You add the equations to get rid of one variable, then you have 6x=24 then you divide both sides and you have x=4, then you substitute the given value of x and you are left with 5*4 - y = 9. And the solution or well possible solution is y = 11 which gives youuuuu. (x , y) = (4 , 11)
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Step-by-step explanation:

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Two people bought a 13-inch sandwich to share. How many inches of sandwich does each person get if they split it evenly? Choose
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The path of a ball kicked from the ground can be modeled by the equation y=−1/5(x−5)(x−20), where x and y are measured in feet.
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Answer:

Step-by-step explanation:

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4 years ago
The highway speeds of 100 cars are summarized in the frequency distribution below. Find the mean speed. Speed (MPH) Cars 30-39 5
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The mean speed of the 100 cars is 55.4

<h3>How to determine the mean?</h3>

The table of values is given as:

Speed (MPH) Cars

30-39              5

40-49              18

50-59             50

60-69              17

70-79              10

Rewrite the frequency table to include the class midpoints

x                   f

34.5               5

44.5              18

54.5             50

64.5              17

74.5              10

The mean speed is then calculated as:

\bar x =\frac{\sum fx}{\sum f}

So, we have:

\bar x = \frac{34.5 * 5 + 44.5 * 18  +  54.5 * 50 + 64.5 * 17 +  74.5 * 10}{100}

Evaluate

\bar x = 55.4

Hence, the mean speed is 55.4

Read more about mean at:

brainly.com/question/14532771

#SPJ1

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