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3 years ago

15

Simplify (-6)^-3 and explain

2 answers:

nata0808 [166]3 years ago

4 0

Ok so in this problem we will use some laws that relate to exponents.

x^-1 = 1/x this is the law we will use in this case.

-6^(-3) simplified is 1/-6^3 then from there evaluate -6^3, which is -216.

So the final answer is 1/-216

gizmo_the_mogwai [7]3 years ago

3 0

So basically we are multiplying the number -6 3 times they are trying to trick you. BUT a tip is to think of it as regular multiplication and then applying that to exponents. So first multiply 6 times 6 whixh is 36 times 6 which is 216 so 1/216 should be your final answer.

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A chemist examines 12 sedimentary samples for bromide concentraction. The mean bromide concentration for the sample date is 0.43

Umnica [9.8K]

Answer:

a) $z = 1.645$

b) Lower endpoint: 0.422cc/m³

Upper endpoint: 0.452 cc/m³

Step-by-step explanation:

Population is approximately normal, so we can find the normal confidence interval.

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 $z = 1.645$ . This is the critical value, the answer for a).

Now, find 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.

$M = 1.645*\frac{0.0325}{\sqrt{12}} = 0.015$

The lower end of the interval is the sample mean subtracted by M. So it is 0.437 - 0.015 = 0.422cc/m³.

The upper end of the interval is the sample mean added to M. So it is 0.437 + 0.015 = 0.452 cc/m³.

b)

Lower endpoint: 0.422cc/m³

Upper endpoint: 0.452 cc/m³

4 0

3 years ago

If the expression is expanded, what is the coefficient of x?

Nana76 [90]

Answer:

Coefficient is equal to 12

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Rasek [7]

Answer:

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Step-by-step explanation:

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exis [7]

The best answer is d

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Lisa [10]

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