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Rina8888 [55]
3 years ago
10

Rewrite the function f(x)=7 (1/2)^3x using the properties of exponents.

Mathematics
1 answer:
Nutka1998 [239]3 years ago
3 0

Answer:

f(x) = (7 x)\/8

Step-by-step explanation:

idk, i just used wolframalpha mate...

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Which multimedia sources are best for a student writing a research paper on childhood obesity? Check all that apply.
seropon [69]

Answer:

The answer is 1&2  

Step-by-step explanation:

1.) and documentary is one of the best resource if you have nothing. but if all else fails talk to a doctor they will help you.

Hope this helps :) :) :) :)

7 0
3 years ago
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after spending 7/9 of a three hours examination, a student left the exams hall. How many minutes has he to complete the duration
Montano1993 [528]
40 mins left! total time= 60 mins x 3 hours =180 mins. 180 divided by 9 is 20. 20 times 7 is 140. 180-140 equals 40. yay!
6 0
3 years ago
The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books check
Verdich [7]

Answer:

n=(\frac{1.960(150)}{90})^2 =10.67 \approx 11

So the answer for this case would be n=11 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

\sigma =150 represent the population standard deviation

n represent the sample size  

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

The confidence interval for this case is given by: (740, 920)

We can find the estimate for the mean and we got:

\bar X = \frac{740+920}{2} = 830

and the margin of error is given by :

ME = \frac{920-740}{2}= 90

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{s}{\sqrt{n}}    (a)

And on this case we have that ME =90 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} s}{ME})^2   (b)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025;0;1)", and we got z_{\alpha/2}=1.960, replacing into formula (b) we got:

n=(\frac{1.960(150)}{90})^2 =10.67 \approx 11

So the answer for this case would be n=11 rounded up to the nearest integer

5 0
3 years ago
An average of 20 pears were sold from Monday to Friday. After the sales on Saturday and Sunday, the average pears sold per day w
Fittoniya [83]

Answer:

5 pears

Step-by-step explanation:

Given that

The  average of 20 pears were sold from Monday to Friday

But after the sales on Saturday and Sunday, the average pears sold per day were increased to 25

We need to determine the number of pears sold on Saturday and sunday

So, it is

= 25 pears - 20 pears

= 5 pears

4 0
3 years ago
Find 5.7 - 7.1 . pls show work
MrRissso [65]

Answer:

-2.6

Step-by-step explanation:

Basically you just subtract 7.1 from 5.7 which will give you -2.6 I don't really know how to explain it much more

3 0
3 years ago
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