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Artyom0805 [142]
2 years ago
6

A circle has a radius of 30 cm.

Mathematics
2 answers:
Papessa [141]2 years ago
6 0

Answer: the area of the circle is 2827.43cm²

Step-by-step explanation:

topjm [15]2 years ago
4 0
It would be 60 because all you do is double the radius because it is only half of the circle
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A square rug covers 79 square feet of floor. What is the approximate length of one side of the rug? (Approximate to the nearest
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Answer:

  8.89 feet

Step-by-step explanation:

The square of the side length is 79 ft², so the side length is the square root of that:

  √(79 ft²) ≈ 8.88819 ft ≈ 8.89 ft

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3 years ago
If the fraction equals the repeating decimal 0.0476190476190..., what is the 51st digit after the decimal point of the repeating
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The average of 6 ages men is 35 years and the average of four of them is 32. Find the ages of the remaining two men if one is 3
prisoha [69]

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the first one must be 39.5 and the other 42.5

Step-by-step explanation:

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The management of a relatively new social networking website named BooglePlus is conducting a pilot study comparing use of its o
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Answer:

0.0623 ± ( 2.056 )( 0.0224 ) can be used to compute a 95% confidence interval for the slope of the population regression line of y on x

Step-by-step explanation:

Given the data in the question;

sample size n = 28

slope of the least squares regression line of y on x or sample estimate = 0.0623

standard error = 0.0224

95% confidence interval

level of significance ∝ = 1 - 95% = 1 - 0.95 = 0.05

degree of freedom df = n - 2 = 28 - 2 = 26

∴ the equation will be;

⇒ sample estimate ± ( t-test) ( standard error )

⇒ sample estimate ± ( t_{\alpha /2, df) ( standard error )

⇒ sample estimate ± ( t_{0.05 /2, 26) ( standard error )

⇒ sample estimate ± ( t_{0.025, 26) ( standard error )

{ from t table; ( t_{0.025, 26) = 2.055529 = 2.056

so we substitute

⇒ 0.0623 ± ( 2.056 )( 0.0224 )

Therefore, 0.0623 ± ( 2.056 )( 0.0224 ) can be used to compute a 95% confidence interval for the slope of the population regression line of y on x

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How long did it take a biker to travel 20 miles at 12mph
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