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3 years ago

Help with 1 and 3 please........

Mathematics

1 answer:

77julia77 [94]3 years ago

5 0

Answer:

P = 9+9+14+14= 46cm

A = Base (14 cm) × Height (7cm)

14×7= 98 cm²

3. P= 1.2 +2.0 +1.6= 4.6m

A = 1/2 B×H

= 1/2 1.6× 1.2

= 0.96 m²

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Anon25 [30]

Answer: The expression has 3 terms

The expression represents the sum of 9z,4y, and 3x

The expression represents y multiplied by 4 plus x multiplied by 3 plus z multiplied by 9

The second term has a coefficient of 4

Step-by-step explanation:

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3 years ago

8. Judges in a skateboarding competition gave scores of 8.2, 81, 81, 8.4Which two scores were closest to one another? Explain.

kobusy [5.1K]

Do you have answer options for this question?

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3 years ago

6.Suppose the Gallup Organization wants to estimate the population proportion of those who think there should be a law that woul

drek231 [11]

Answer:

A sample of $n = (\frac{1.96\sqrt{0.3696*0.6304}}{E})^2$ is needed, in which E is the desired margin of error, as a proportion. If we find a decimal value, we round up to the next whole number.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

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The margin of error is of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

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This means that $n = 1012, \pi = \frac{374}{1012} = 0.3696$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

How large a sample size is needed to be 95% confident with a margin of error of E?

A sample size of n is needed, and n is found when M = E.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$E = 1.96\sqrt{\frac{0.3696*0.6304}{n}}$

$E\sqrt{n} = 1.96\sqrt{0.3696*0.6304}$

$\sqrt{n} = \frac{1.96\sqrt{0.3696*0.6304}}{E}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{0.3696*0.6304}}{E})^2$

$n = (\frac{1.96\sqrt{0.3696*0.6304}}{E})^2$

A sample of $n = (\frac{1.96\sqrt{0.3696*0.6304}}{E})^2$ is needed, in which E is the desired margin of error, as a proportion. If we find a decimal value, we round up to the next whole number.

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3 years ago

Find the image of A(-2,4) under a translation (x,y)->(x-2,y-3)

vichka [17]

Answer:

Point A would be at the coordinates, (-4, 1). Hope this helps!

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2 years ago

How do you solve 3 (x - 4) = 12?<br> I'm really stuck on these type of questions

jolli1 [7]

Answer:

Step-by-step explanation:

Here you go mate

Use PEMDAS

Parenthesis,Exponent,Multiplication,Division,Addition,Subtraction

Step 1

3(x-4)=12 Equation/Question

Step 2

3(x-4)=12 Remove parenthesis

3x-12=12

Step 3

3x-12=12 Add 12 to sides

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Step 4

3x=24 Divide sides by 3

answer

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3 years ago