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riadik2000 [5.3K]
3 years ago
11

Marc has 45 CDs in his collection, and Corinna has 61. If Marc buys 4 new CDs each month and Corinna buys 2 new CDs each month,

after how many months will Marc and Corinna have the same number of CDs
Mathematics
1 answer:
FinnZ [79.3K]3 years ago
3 0

Answer:

8 months

Step-by-step explanation:

x=# of months

45+4x=2x+61

45+2x=61

2x=16

x=8

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Step-by-step explanation:

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3y=-2x+4

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The reference slope is -(2/3).  The negative inverse is (3/2), which will be the slope of a perpendicular line.  We can write the new line as:

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Any value of b will still result in a line that is perpendicular.  But we want a value of b that will shift the line so that it intersects the point (-3,-5).  Simply enter this point in the above equation and solve for b.

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-5 = (3/2)(-3) + b

-5 = -(9/2) + b

-5 = -4.5 + b

b = - 0.5

The equation of the line that is perpendicular to 2x + 3y = 4 and includes point (-3,-5) is

y = (3/2)x - 0.5

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2 years ago
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The outlier of a dataset is a data element that is relatively far from the remaining data elements

  • <em>99 is an outlier of pet group</em>
  • <em>See attachment for the parallel box plots</em>

<u>(a) Prove that 99 is an outlier for Pet</u>

We have:

<em>Pets: 58 64 65 68 69 69 69 70 70 72 76 79 85 86 99</em>

n = 15

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Q_1 = \frac{15 + 1}{4}

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Q_1 = 4th

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The data elements at the 4th and 12th positions are 68 and 79

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Q_1 = 68

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The lower and upper limits of the outlier are:

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U = 95.5

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<u>(b) The parallel box plot</u>

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<em>Pets: 58 64 65 68 69 69 69 70 70 72 76 79 85 86 99</em>

<em>Erlento: 88 80 80 81 92 87 88 81 82 80 87 92 87 80 82 </em>

<em>Alone: 62 70 73 75 77 80 84 84 84 87 87 87 90 91 99</em>

<em />

See attachment for the parallel box plots

Read more about box plots and outliers at:

brainly.com/question/14940764

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