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3 years ago

List all the elements of each set. Set of the values of x that turn equation 0.7(x−7)−4.9=5.7 into a true statement

Mathematics

1 answer:

Paraphin [41]3 years ago

3 0

Answer: 22.14 (22.1428571429)

Step-by-step explanation:

Let's Start with the equation

0.7(x−7)−4.9=5.7

Add 4.9 to both sides

0.7(x-7)=10.6

Divide both sides by 0.7

x-7= 15. 1428571429

Add 7 to both sides

x= 22.1428571429 or 22.14

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2 years ago

5. Last year, Mr. Petersen's rectangular garden had a width of 5 meters and an area of 20 square meters.

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Answer:

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3 years ago

A superintendent of a school district conducted a survey to find out the level of job satisfaction among teachers. Out of 53 tea

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Answer:

b. 1.15

Step-by-step explanation:

The z statistics is given by:

$Z = \frac{X - p}{s}$

In which X is the found proportion, p is the expected proportion, and s, which is the standard error is $s = \sqrt{\frac{p(1-p)}{n}}$

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This means that $X = \frac{13}{53} = 0.2453$

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$s = \sqrt{\frac{0.184*0.816}{53}} = 0.0532$

Z-statistic:

$Z = \frac{X - p}{s}$

$Z = \frac{0.2453 - 0.184}{0.0532}$

$Z = 1.15$

The correct answer is:

b. 1.15

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4 years ago