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4 years ago

What is the difference between f(x) and y (Quadratic Functions)

2 answers:

5 0

F(x) is not necessarily for graphs as it can be used with composites eg fg(x) but can be shown graphically but y= is purely for a graph

Natali [406]4 years ago

3 0

There is no difference. y and f(x) is the exact same thing. They are both the result after you apply a function to x. That is what f(x) stands for.

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3 years ago

VERY DIFFICULT!! HELP NEEDED

Nataly [62]

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3 years ago

Write your answer in simplest form.<br> -2/3+7/9

viktelen [127]

Answer:

1/9

Step-by-step explanation:

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I hope this information was of any use to you.

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3 years ago

The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.

valina [46]

Answer:

A sample of 179 is needed.

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:

$\alpha = \frac{1 - 0.85}{2} = 0.075$

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

That is z with a pvalue of $1 - 0.075 = 0.925$ , so Z = 1.44.

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.

A previous study found that for an average family the variance is 1.69 gallon?

This means that $\sigma = \sqrt{1.69} = 1.3$

If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?

A sample of n is needed, and n is found for M = 0.14. So

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

$0.14 = 1.44\frac{1.3}{\sqrt{n}}$

$0.14\sqrt{n} = 1.44*1.3$

$\sqrt{n} = \frac{1.44*1.3}{0.14}$

$(\sqrt{n})^2 = (\frac{1.44*1.3}{0.14})^2$

$n = 178.8$

Rounding up

A sample of 179 is needed.

7 0

3 years ago

Help me please!!!!!!!!

DedPeter [7]

I think it’s d for the standard equation

7 0

3 years ago

Read 2 more answers