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3 years ago

Question 6 (5 points)

Mathematics

2 answers:

Assoli18 [71]3 years ago

4 0

Answer:

(-6,4)

Step-by-step explanation:

Solve the following system:

{4 y + 5 x = -14 | (equation 1)

2 y + x = 2 | (equation 2)

Subtract 1/5 × (equation 1) from equation 2:

{5 x + 4 y = -14 | (equation 1)

0 x+(6 y)/5 = 24/5 | (equation 2)

Multiply equation 2 by 5/6:

{5 x + 4 y = -14 | (equation 1)

0 x+y = 4 | (equation 2)

Subtract 4 × (equation 2) from equation 1:

{5 x+0 y = -30 | (equation 1)

0 x+y = 4 | (equation 2)

Divide equation 1 by 5:

{x+0 y = -6 | (equation 1)

0 x+y = 4 | (equation 2)

Collect results:

Answer: {x = -6 , y = 4

Airida [17]3 years ago

4 0

Answer:

Step-by-step explanation:

5x + 4y = -14

-5x - 10y = - 10

-6y = -24

y= 4

x + 2(4) = 2

x + 8 = 2

x = -6

(-6, 4)

Option 3

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$\mu = 74$

and

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Therefore the sampling distribution has a mean of

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We need to convert to z-score.

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Part c)

We want to find

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We convert to z-score and use the normal distribution table to find the corresponding area.

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Part d)

We want to find :

$P(73\:$

We convert to z-scores and again use the standard normal distribution table.

$P( \frac{73 - 74}{1} \:< \: z$

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