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3 years ago

In solving for systems of equations, by graphing, im sorry but I really need help, with one question, y= 2x + 3

Mathematics

2 answers:

elena-14-01-66 [18.8K]3 years ago

8 0

Is there another equation? A system of equations means more than one equation and you only provided one. Thanks

OLga [1]3 years ago

6 0

2x=3-y so collect the likes term which is xy= 3\2

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Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH lev

stiv31 [10]

Answer:

The mean and standard deviation of the corrected pH measurements are 6.63 and 3.8025 respectively.

Step-by-step explanation:

We can correct the values of the mean and standard deviation using the properties of the mean and the variance.

To the original value X we have to add 0.2 and multiply then by 1.3 to calculate the new and corrected value Y:

$Y=1.3(X+0.2)$

The mean and standard deviation of the original value X are 4.9 and 1.5 respectively.

Then, we can apply the properties of the mean as:

$E(Y)=E(1.3(X+0.2))=1.3E(X+0.2)=1.3E(X)+1.3*0.2\\\\E(Y)=1.3E(X)+0.26\\\\E(Y)=1.3*4.9+0.26=6.37+0.26=6.63$

For the standard deviation, we apply the properties of variance:

$V(Y)=V(1.3(X+0.2))\\\\V(Y)=1.3^2\cdot V(X+0.2)\\\\V(Y)=1.69\cdot V(X)\\\\V(Y)=1.69\cdot 1.5^2=1.69\cdot 2.25=3.8025$

The properties that have been applied are:

$1.\,E(aX)=aE(X)\\\\ 2.\,E(X+b)=E(X)+b\\\\3.\,V(aX)=a^2V(X)\\\\4.\,V(X+b)=V(X)+0$

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viktelen [127]

1. <span>Divide the numerator by the denominator.
2. Write down the whole number answer.
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Step-by-step explanation:

explain all steps to prove or disprove.

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The answer is 0.58
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lora16 [44]

Answer:

N=16

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Step-by-step explanation:

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3 years ago