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Veronika [31]
2 years ago
9

Solve the system of linear equations by using the elimination method: 4x+ y = 36 8x- y = 60

Mathematics
1 answer:
katrin [286]2 years ago
8 0

Answer:

(8,4)

Step-by-step explanation:

y and -y cancels out leaving you with "12x=96"

that simplifies to "x=8"

Then you substitute 8 into the "x" from either equation and y should equal 4

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I need help with this...
Korvikt [17]

Answer:

b=5.76or 576

c=2.4 or 0.024

7 0
3 years ago
All the while the dog sat in the snow, its wolf-brush of a tail curled around warmly over its forefeet, its wolf-ears are forwar
nalin [4]

Answer:21

Step-by-step explanation:

4 0
3 years ago
Find the mean of the data summarized in the given frequency distribution. Compare the computed mean to the actual mean of 47.3 m
Marta_Voda [28]

Answer:

\bar X = \frac{2276}{48}=47.417

If we compare this value with the 47.3 proposed we have the following error

Error = \frac{|Actual-real|}{real}*100 = \frac{|47.417-47.3|}{47.3}*100 =0.247\%

The computed mean is close to the actual mean because the difference between the means is less than 5%.  

Step-by-step explanation:

Assuming the following dataset:

Speed   42-45  46-49  50-53  54-57  58-61

Freq.         21        15        6           4          2

And we are interested in find the mean, since we have grouped data the formula for the mean is given by:

\bar X = \frac{\sum_{i=1}^n x_i f_i}{\sum_{i=1}^n f_i}

And is useful construct a table like this one:

Speed     Freq    Midpoint   Freq*Midpoint

42-45       21            43.5       913.5

46-49       15            47.5        712.5

50-53       6             51.5         309

54-57        4            55.5         222

58-61        2             59.5        119

Total       48                           2276

And the mean is given by:

\bar X = \frac{2276}{48}=47.417

If we compare this value with the 47.3 proposed we have the following error

Error = \frac{|Actual-real|}{real}*100 = \frac{|47.417-47.3|}{47.3}*100 =0.247\%

The computed mean is close to the actual mean because the difference between the means is less than 5%.  

6 0
3 years ago
X/3 + 5 = 6.8<br><br> The x/3 is a fraction! please I need an answer!!!
Naya [18.7K]

Answer:

x=5.4

Step-by-step explanation:

x/3+5=6.8

     -5  -5

__________

x/3= 1.8

 *3

________

x= 5.4

7 0
3 years ago
Someone please help me answer
Bingel [31]
Simplify the exponents
3-2=1 therefore it should be 1/7 the third answer. Hope that helps
7 0
3 years ago
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