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Karolina [17]
3 years ago
8

What is (2/5x + 5) - (1/5x - 3)?

Mathematics
1 answer:
miv72 [106K]3 years ago
5 0
X/5+8. Hope this helped!
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Public health officials believe that 90% of children have been vaccinated against measles. A random survey of medical records at
Vikentia [17]

Answer:

The answer to the question is;

Yes, it is very significant as the number of of observed vaccinated children is below the number of actually vaccinated children by 78.

Step-by-step explanation:

The result of the survey of more than 13,000 children indicate that only 89.4 % had actually been and the P-value indicate that the chance of having a sample proportion of 89.4 %  vaccinated is 1.1 %.

P is low at 0.011 for which however the proportion of those vaccinated is between 0.889 and 0.899 using a 95% confidence interval, whereby the decrease from 90 % believed to 89.9 % is small, albeit it depends on the size of the population.

At 89.4 %, in a sample of 13,000, the number of children expected to have been vaccinated but were missed is equal to 90 - 89.4 = 0.6 % = 0.006

Therefore the children missed = 78 children which is significant.

5 0
4 years ago
Reimann Sum... I got it wrong twice... Please help and provide step by step clear explaination. I'd appreciate it.
AnnyKZ [126]
Formula for Riemann Sum is:
\frac{b-a}{n} \sum_{i=1}^n f(a + i \frac{b-a}{n})
interval is [1,3] so a = 1, b = 3
f(x) = 3x , sub into Riemann sum

\frac{2}{n} \sum_{i=1}^n 3(1 + \frac{2i}{n})

Continue by simplifying using properties of summations.
= \frac{2}{n}\sum_{i=1}^n 3 +  \frac{2}{n}\sum_{i=1}^n \frac{6i}{n} \\  \\ = \frac{6}{n}\sum_{i=1}^n 1 +  \frac{12}{n^2}\sum_{i=1}^n i \\  \\ =\frac{6}{n} (n) + \frac{12}{n^2}(\frac{n(n+1)}{2}) \\  \\ =6+\frac{6}{n}(n+1) \\  \\ =12 + \frac{6}{n}

Now you have an expression for the summation in terms of 'n'.

Next, take the limit as n-> infinity.
The limit of \frac{6}{n} goes to 0, therefore the limit of the summation is 12.

The area under the curve from [1,3] is equal to limit of summation which is 12.
7 0
3 years ago
Question 22 of 25
bekas [8.4K]

Answer:

36 pi

Step-by-step explanation:

Aera of sphere is : 4 *pi *r^2

A=4 *pi*9=36pi=113

8 0
3 years ago
Multiply and simplify completely:<br><br> (3x + 5) (2x2 – 3x + 2)<br> Show all work for full credit.
Bezzdna [24]

Answer:

open brackets we get

6x³ - 9x² + 6x + 10x² - 15x + 10

6x³ + x² -9x + 10

7 0
3 years ago
Y varies inversely as x: y=13, when x=3
Sonbull [250]

Answer:

I'm not to sure of this answer

3 0
3 years ago
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