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Rudiy27
3 years ago
13

A sample is random sample is valid

Mathematics
2 answers:
wlad13 [49]3 years ago
8 0
If the sample is random, it is not valid.
jenyasd209 [6]3 years ago
6 0
A sample can be valid.
But, a random sample can sometimes be valid.
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Seven times a sum of a number and 1 is 63
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Step-by-step explanation:

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3 years ago
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sergey [27]

x = 3 + y Eqn(1)

y = -2x + 9​ Eqn(2)

Let us solve the system of equations with the substitution method

x - 3 = y (Subtracting 3 from both sides of the Eqn(1))

Replacing y = x - 3 in Eqn (2), we have:

x - 3 = -2x + 9

x = -2x + 9 + 3 (Adding 3 to both sides of the equation)

x + 2x = 9 + 3 (Adding 2x to both sides of the equation)

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x = 12/3 (Dividing by 3 on both sides of the equation)

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y=1

The answers are:

x= 4 and y=1

6 0
1 year ago
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