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quester [9]
3 years ago
10

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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Answer:

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Step-by-step explanation:

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First, covert 2 3/4 into an improper fraction

Then after you do that you get 11/4

so you do the equation 11/4 ÷ 1/4

when you do kcf it would be 11/4 × 4/1=

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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
laiz [17]

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)

P(x > 103)

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

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

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