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lesya692 [45]
3 years ago
9

If y is an nonnegative , would it be describing a inequality or interval notation?

Mathematics
1 answer:
Viefleur [7K]3 years ago
3 0
Sorry this is not a answer but I have to use this as one due to the question asking.... whelp
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The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. A
anygoal [31]

Answer:

The 90% confidence interval for the mean usage of electricity is between 17.4 kwH and 17.6 kwH

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} = 0.025

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 1-0.05 = 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.

So

M = 1.645*\frac{2.4}{\sqrt{796}} = 0.14

The lower end of the interval is the mean subtracted by M. So 17.5 - 0.14 = 17.4 kwH

The upper end of the interval is M added to the mean. So 17.5 + 0.14 = 17.6 kwH

The 90% confidence interval for the mean usage of electricity is between 17.4 kwH and 17.6 kwH

4 0
3 years ago
Evaluate:<br> Two to the fifth power.
Gekata [30.6K]

Answer:32

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Determine the output, f(x), if the input to the function box below is 8.<br><br> f(x)=3x-1
Harman [31]

Answer:

The output is 23

Step-by-step explanation:

we know that

f(x) ----> is the output

x ----> is the input

we have that

f(x)=3x-1

For x=8 (input)

Find the value of f(x) (output)

f(8)=3(8)-1=23

The output is 23

7 0
3 years ago
Simplify (4x^2 - 8xy + 2y^2) - (9x^2 - 4xy - 7y^2)
NARA [144]

Answer:

b

Step-by-step explanation:

Distribute parenthesis and collect like terms, noting that the second parenthesis is distributed by - 1

(4x² - 8xy +2y²) - (9x² - 4xy - 7y²)

= 4x² - 8xy + 2y² - 9x² + 4xy + 7y² ← collect like terms

= (4x² - 9x²) + (- 8xy + 4xy) + (2y² + 7y²)

= - 5x² - 4xy + 9y² → b


4 0
4 years ago
Read 2 more answers
ANSWER ASAP PLS &lt;3 <br> 20 points !<br> Which expression matches the graph?
KiRa [710]

Answer: the answer is b?

hope this helps

4 0
3 years ago
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