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Naddika [18.5K]
3 years ago
14

Solve 7x +2x over 3 =5

Mathematics
1 answer:
Oksi-84 [34.3K]3 years ago
3 0
X= 15/9 — combine like terms to get 9x/3=15. Isolate the variable by multiplying both sides by 3. 9x=15 — divide both sides by 9 to isolate variable.
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Step-by-step explanation:

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Which statement is always true?
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Line b passes through the Point(-3, -4) and has a slope of -1/2. What is the equation of Line b in standard form?
Anna11 [10]

Answer:

x+2y=-11

Step-by-step explanation:

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y=mx+b

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y=-\frac{1}{2}x+b

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y=-\frac{1}{2}x-\frac{11}{2}

Now,

The standard form is given by:

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The first answer choice is right.

3 0
3 years ago
The formula for the standard deviation of a sample is:
timofeeve [1]

Answer:

d. The variance is 9.56 and the standard deviation is 3.09.

Step-by-step explanation:

From the above question, we are given the following data set.

3, 7, 8, 8, 8, 9, 10, 10, 13, 14

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= 90/10

= 9

b) Variance

The formula for sample Variance = (Mean - x)²/ n - 1

Mean = 9

n = 10

Sample Variance =

(3 - 9)² + (7 - 9)² + (8 - 9)² + (8 - 9)² + (8 - 9)² + (9 - 9)² + (10 - 9)² + (10 - 9)² + (13 - 9)² + (14 - 9)² / 10 - 1

= 36 + 4 + 1 + 1 + 1 + 0 + 1 + 1 + 16 + 25/9

= 86/9

= 9.555555556

≈ Approximately 9.56

Variance = 9.56

Sample Standard deviation = √Sample Variance

= √9.56

= 3.0919249667

≈ Approximately 3.09

5 0
3 years ago
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