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3 years ago

Solve by substitution 1. 6x+ 5y=7 x-y=3 2. 3a +2b =4 2a + b=6 3. 2x + y= 4 4x -y=2

Mathematics

1 answer:

Juli2301 [7.4K]3 years ago

8 0

Answer:

1. y = 11

x = -48

2. a =8

b= -10

3. x= 1

y= 2

Step-by-step explanation:

1 . 6x + 5y = 7

x-y= 3

6x+5y = 7

6x-6y =18

-1y = - 11

6x + 5y = 7

y = 11

6x + 55 = 7

6x = -48

x = -48

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Read 2 more answers

Assume that IQ scores are normally distributed with a mean of 100 and a standard deviation of 16. If 100 people are randomly sel

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Answer:

0.03 is the probability that for the sample mean IQ score is greater than 103.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 100

Standard Deviation, σ = 16

Sample size, n = 100

We are given that the distribution of IQ score is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

Standard error due to sampling =

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P( mean IQ score is greater than 103)

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Calculation the value from standard normal z table, we have,

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