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Feliz [49]
3 years ago
15

The surface area of a cube is 24 cm² what is the new surface area of a cube is the length of each edge of the cube is tripled

Mathematics
1 answer:
sergij07 [2.7K]3 years ago
8 0
24 divided by 6( the amount of sides) is 4. The square root of 4 is 2 so each side is 2 cm. 2 cm tripled is 6 cm. 6 times 6 is 36 ( that is the surface area of one face). 36 times 6 (the number of faces) is 216 so the answer is 216 cm squared.
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What is the most reasonable for the weight of a table and four chairs? A 19 pounds B 90 pounds C 900 pounds D 9 tons
Rom4ik [11]

Answer:

B. 90 pounds.

Step-by-step explanation:

19 pounds would be too light, 900 pounds would be too heavy, and 9 tons is equal to 18,000 pounds which is wayy too heavy.

Hope this helps!

7 0
3 years ago
What value of x is in the solution set of 2(3x - 1) > 4x - 6?
Dmitriy789 [7]

Answer:

-1

Step-by-step explanation:

Distribute

6x - 2 >= 4x - 6

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x >= -2

8 0
3 years ago
What expression represents the quotient?
Olenka [21]

Answer:

C

Step-by-step explanation:

Given

\frac{5x^2+8x+7}{4x}

Divide each term on the numerator by 4x

= \frac{5x^2}{4x} + \frac{8x}{4x} + \frac{7}{4x}

= \frac{5x}{4} + 2 + \frac{7}{4x}

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3 years ago
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vodka [1.7K]

Answer:

Exact Form:

log  ( 7 )

log  ( 3 )

Decimal Form:

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Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
What is the formula for a confidence interval?
ikadub [295]

Answer:

a) The formula is given by mean \pm the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.

b) \bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

If the distribution for X is normal or if the sample size is large enough we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

Part a

The formula is given by mean \pm the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.

Part b

The confidence interval for the mean is given by the following formula:  

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}

5 0
3 years ago
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