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Snezhnost [94]
3 years ago
11

Pre Calculus, please help?

Mathematics
1 answer:
barxatty [35]3 years ago
4 0
Hold up I need to ask my older brother to help with this one
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In monitoring lead in the air after the explosion at the battery factory, it is found that the amounts of lead over a 7 day peri
Andrew [12]

Answer:

MOE=\pm \ 1.41

Step-by-step explanation:

-Given that \sigma=1.91, n=7

-We determine the z-value corresponding to the 95% confidence level:

z_{\alpha/2}=z_{0.025}=1.96

-The margin of error is the degree of error from the real value and is calculated as follows:

MOE=\pm z_{\alpha/2} (\frac{\sigma}{\sqrt{n}})\\\\=\pm z_{0.025}\times\frac{\sigma}{\sqrt{n}}\\\\=\pm 1.96\times \frac{1.91}{\sqrt{7}}\\\\=\pm 1.41

Hence, the margin of error is \pm 1.41

7 0
3 years ago
the lateral area of a right circular cone is 20pi cm^2 and the total area is 36pi cm^2 find the volume of the cone
Lady bird [3.3K]
Let r = radius, h = height and l = slant height 

Lateral area = rlpi 

But l = sqrt(r^2 + h^2) 

Lateral area = r sqrt( r^2 + h^2) pi = 20 pi..................(1) 

Total area = r sqrt( r^2 + h^2) pi + r^2 pi = 36pi......(2) 

Subtract (1) from (2) 

r^2 pi = 16 pi 

r^2 = 16 

r = 4 cm 

Put this value in (1) to find h 

4sqrt(4^2 + h^2) pi = 20 pi 

sqrt(16 + h^2) = 5 

Square both sides 

16 + h^2 = 25 

h^2 = 9 

h = 3 cm 

Now that we know h and r we can find the volume 


V = 1/3 pi r^2 h 

= 1/3 pi (4^2)(3) 

<span>= 16 pi cm^3 .........( = 50.27 cm^3)

I hope my answer has come to your help. God bless and have a nice day ahead!
</span>
8 0
3 years ago
Read 2 more answers
Which of the following is true of the composition F(G(x))?
Hunter-Best [27]

Answer:

<u>A</u>

Step-by-step explanation:

The statement which is true regarding the composition of F(G(x)) is :

<u><em>The function F(G(x)) depends on G(x).</em></u>

<u><em /></u>

This is because only depending on G(x) the value of the whole function can change.

5 0
2 years ago
Read 2 more answers
If 2a/b=1/2,what is the value of b/a?
Oxana [17]
Simple as faqqqqqqqqqqqq

4 0
3 years ago
Read 2 more answers
32% of 35 pages please help
zepelin [54]
In order to answer this, first convert every percentage into decimal value.
The decimal value of 32% is 0.32. We just move two decimal places to the left.

Next move is to multiply the converted percent to the whole or total.
So,
= 0.32 * 35
= 11.2
Take note, there are no decimal pages. So the final answer is 11.
There are 11 pages.
4 0
3 years ago
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