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aniked [119]
3 years ago
10

How to add and subtract rational numbers

Mathematics
1 answer:
fenix001 [56]3 years ago
7 0
Before you add or subtract, the rational numbers should have the same bottom number(called a common denominator.)
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Use the following information to answer problems 14-16: Suppose that in a large metropolitan area, 82% of all households have ca
Helen [10]

Answer:

66.6% or 0.66

Step-by-step explanation:

82% or 0.82 of All households have cable TV.

X = The number of households in a group of 6, that have cable TV.

You wish to find the proportion or percentage of groups for which EXACTLY 4 of 6 households will have cable TV.

82% of 6 is = 4.92

Approximately 4.92 out of 6 households, have cable TV.

Using this figure, you can now find out what % of 6 will give you 4.

Cross multiply:

0.82 - 4.92

M - 4

M = (4×0.82) ÷ 4.92 = 3.28÷4.92 = 0.666

Hence, 66.6% of 6 households, have cable TV. In other words, exactly 4 households (X=4) have cable TV.

To test, you can find what 66% of 6 is. You will get 4.

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3 years ago
HURRYYY PLEASE THIS IS A TESTTT <br> Find the value of x.
o-na [289]

Answer:

130° is the answer to it

Step-by-step explanation:

180-50=130

6 0
3 years ago
Read 2 more answers
A fluid moves through a tube of length 1 meter and radius r=0.006±0.00025 meters under a pressure p=4⋅105±2000 pascals, at a rat
iris [78.8K]

Answer:

Maximum error for viscosity is 17.14%

Step-by-step explanation:

We know that everything is changing with respect to the time, "r" is changing with respect to the time, and also "p" just "v" will not change with the time according to the information given, so we can find the implicit derivative with respect to the time, and since

n = (\frac{\pi}{8}) (\frac{pr^4}{v})\\

The implicit derivative with respect to the time would be

\frac{dn}{dt}  = \frac{\pi}{8} ( \frac{r^4}{v} \frac{dp}{dt}  + \frac{4pr^3}{v}\frac{dr}{dt} )

If we multiply everything by    dt   we get  

dn  = \frac{\pi}{8} ( \frac{r^4}{v} dp  + \frac{4pr^3}{v}  dr})

Remember that  the error is given by   \frac{dn}{n}   therefore doing some algebra we get that

\frac{dn}{n}  =    4 \frac{dr}{r}  +  \frac{dp}{p}

Since,    r = 0.006   ,   dr = 0.00025 ,  p = 4*105   ,   dp = 2000  we get that

\frac{dn}{n} = 0.1714

Which means that  the maximum error for viscosity is 17.14%.  

5 0
3 years ago
A store offered a 20% price discount on all items on Friday. By what fraction of the discounted price of an item did the price i
grin007 [14]

Answer:

What were two of the important points found in the Monroe Doctrine?

All European nations had to give up their colonies and allow for individual autonomy.

The United States would not allow additional colonization of Latin American nations.

America would not interfere with already established Latin American colonies.

All trade agreements with Latin American nations had to go through the United States.

Step-by-step explanation:

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2 years ago
South Jeff Middle School is raising money for a local charity. Their goal is to raise $500 by their holiday break. If they have
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They should earn 50$ each day because 50x100=500

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