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3 years ago

7

3-3x6+2 and how is that reached, please!

1 answer:

Dvinal [7]3 years ago

3 0

The order of mathematical operation is MDAS.
M - multiplication
D - division
A - addition
S - subtraction

3 - 3 x 6 + 2

Multiplication : 3 x 6 = 18
Division: none
Addition : + 3 + 2 = 5 (combine positive numbers)
Subtraction : 5 - 18 = -13

3 - 18 + 2 = -13

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3 years ago

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1 year ago

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3 years ago

Researchers measured the bone mineral desnsity of the spines of 94 women who had taken teh drug CEE. The mean was 1.016 g/cm2, a

Valentin [98]

Answer:

The 95% confidence interval for the mean is between 0.985g/cm² and 1.047 g/cm².

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:

$\alpha = \frac{1-0.95}{2} = 0.025$

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 $1-0.025 = 0.975$ , so $z = 1.96$

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

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The lower end of the interval is the mean subtracted by M. So it is 1.016 - 0.0310 = 0.985 g/cm²

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3 years ago

Find x in each triangle.<br> PLZ HELP!!!

jonny [76]

Answer:

<u><em>x=3.4</em></u>

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$9+2.56=x^2$

Simplify addition:

$11.56=x^2$

Find the square root:

$\sqrt{11.56}=\sqrt{x^2}$

$3.4=x\\x=3.4$

Finito.

*The hypotenuse is the side opposite the 90° angle and the longest side of a triangle, always.

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2 years ago