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3 years ago

Hello :) Please help me solve this Explain answer

Mathematics

1 answer:

kykrilka [37]3 years ago

7 0

Answer:

B because the rotation of the wheel doesn't change the angle of the spokes.

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What power of 2 is equal to the expression below

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Answer:

Daddy

Step-by-step explanation:

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3 years ago

A + (B + C) = (A + B) + C <br> property

charle [14.2K]

Answer:

a+b

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3 years ago

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You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you beli

zhuklara [117]

Answer:

We need to sample at least 1069 parents.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How many parents do you have to sample?

We need to sample at least n parents.

n is found when $M = 4, \sigma = 79.5$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$4 = 1.645*\frac{79.5}{\sqrt{n}}$

$4\sqrt{n} = 1.645*79.5$

$\sqrt{n} = \frac{1.645*79.5}{4}$

$(\sqrt{n})^{2} = (\frac{1.645*79.5}{4})^{2}$

$n = 1068.92$

Rounding up

We need to sample at least 1069 parents.

6 0

3 years ago

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How to convert 6.9 to a fraction or mixed number

Marianna [84]

6.9 has 1 decimal, therefore we'll use 1 zero and lose the dot

$\bf 6.\underline{9}\implies \cfrac{69}{1\underline{0}}
\\\\\\
\textit{now, 10 goes into 69 \underline{6 times} with a \underline{remainder} of 9}\implies 6\frac{9}{10}$

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3 years ago

Choose the HCF of 6xy^3 and 9x^2y

snow_tiger [21]

Answer:

3xy

Step-by-step explanation:

$6x {y}^{3} = 2 \times 3 \times x \times y \times y \times y \\ 9 {x}^{2} y = 3 \times 3 \times x \times x \times y \\ \\ common \: factors = 3, \: x, \: y \\ \therefore \: HCF = 3\times x\times y\\\therefore \: HCF = 3xy \\$

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3 years ago