If you start off multiplying the mean by 3, you'll get the sum of the numbers = 7.5
This means all three numbers add up to 7.5.

So if you take the other two numbers away from 7.5 you'll have the third number.
7.5 - 1.75 = 5.75
5.75 - 1.3 = 4.45.

The third number is 4.45

Maths

Can you help me please? The question is : The mean of three numbers is 2 and 1/2. Two of the numbers are 1 and 3/4 and 1 and 3/10. Work out the third number.

Excellent question -
The most simple answer is to guide humans.

Muslims believe God didn't just create us & leave, but that he actively guides us to be the best we can be. 
This has come through many different signs & revealed books (like the Torah, & the Bible) when we were at different stages of readiness to accept guidance. The final revelation (the Quran) came to summarise, add to, & finalise the other books - God's final help & guidance to us.

Muslims believe it has the principle solutions to all base problems humans will face. This may include how to live a good personal life, a good family life, & develop as a thriving community (or country).
Humans (scholars - people who understand) need to take the principles & apply to the problems we see today. E.g. we may think technology such as the internet has changed all this, but it's just a tool. We still deal with the same problems like human emotions - just at a much faster rate because our communication tools (like the internet, Facebook etc.) are much faster.

It's a very deep topic that's too complex to fully explain here, but I hope that helped a little! ☺️

Quraan

What is the purpose of the Qur’an, and why is the most important thing/book to Muslims?

It really depends on the job. 
Google Search social work jobs you'd see yourself in, & see if they require a degree.
Alternatively, phone them up & ask - you'd be surprised how much hassle this can save you.
There's a saying I wish I'd lived by earlier in life: if you don't ask, you don't get, & you'll never know! ☺️

Career Advice

How hard would it be for me to get a job in social work if i do not have a social work degree?

To stop procrastinating the best thing to do is get started with the EASIEST part of the thing you NEED to do.

Just thinking about it overwhelms you with dread/fear & makes you procrastinate.
The solution is to promise yourself only to try the easiest first steps e.g. If this means just opening a word browser - just do that. 
An alternative is promising yourself your only going to work for 5 minutes.
This tricks your emotions into letting you start (the hardest part). If you fail, DON'T beat yourself up or feel bad, feel happy you accomplished 5 minutes, then try again.
Hopefully once you start, this will make things much easier to carry on.
This also doesn't mean doing less important things to seem 'busy'.

The other trick to keep going is try & have a 30 minute power nap for every 4 hours of work (or whenever you feel unproductive). Your mind wakes up fresh, ready to study.


Study Skills

How do I stop procrastinating and get into a revision schedule? I want one that I can keep up with and not throw away after a week or so due to the amount of sheer work and stress I get from the schedule. Please help!

Internal economies of scale are firm-specific, or caused internally, while external economies of scale occur based on larger changes outside of the firm. Both types result in declining marginal costs of production; yet, the net effect is the same. External economies of scale are generally described as having an effect on the whole industry.

Economist Alfred Marshall first differentiated between internal and external economies of scale. Marshall suggested that broad declines in the factors of production, such as land, labor and effective capital, represented a positive externality for all firms. These externality arguments are offered in defense of public infrastructure projects or government research.

There are several different kinds of internal economies of scale. Technical economies are achieved from the use of large-scale capital machines or production processes. The classic example of a technical internal economy of scale is Henry Ford's assembly line. Another type occurs when firms purchase in bulk and receive discounts for their large purchases, or a lower cost per unit of input. Cuts in administrative costs can cause marginal productivity to decline, resulting in economies of scale.

Internal economies of scale tend to offer greater competitive advantages than external economies of scale. This is because an external economy of scale tends to be shared among competitor firms. The invention of the automobile or the Internet helped producers of all kinds. If borrowing costs decline across the entire economy because the government is engaged in expansionary monetary policy, the lower rates can be captured by multiple firms. This does not mean any external economy of scale is a wash. Companies can still take relatively greater or lesser advantage of external economies of scale. Nevertheless, internal economies of scale embody a greater degree of exclusivity.


Economics

What are the differences between external and internal economies of scale?

Good answer above. 
I can expand on the second point about knowledge.
Why do you need to expand your knowledge?
What's the point?

The point of knowledge is to aid you in making the best decisions throughout your life. 
What will happen if you do thing A rather than B?
If you want to achieve thing C, what do you do?
How do you avoid failing at thing D?

So then what is 'reading' books really all about?
Books represent the facts or viewpoints according to the author who is not physically present. This author has had life experiences that you may not have. In this way, by reading, you are learning about their experiences - how did they achieve X. Or how did they think about Y.
If we go back to the 'point of knowledge' - if you want to also achieve X, what decisions should you make?

So this raises further questions about what you should read - what do you want to achieve?
Who has already achieved it, and written a book? What did they experience, what challenges did they overcome, and how?
So if you learn this, effectively, you're saving yourself the hassle of needing the experience before you learn what to do. 
In this way knowledge (& therefore reading) is a shortcut.

English

Why should I read more?

Divide the smaller number by the bigger number, then times by 100

E.g. if I wanted to find out 3 as a percentage of 50 I'd do: 
3 / 50 = 0.06
0.06 x 100 = 6
Therefore 3 is 6% of 50.

Hope that helps!

How do you work out percentages

A polygon with six sides is called a Hexagon!

What is a six sided polygon called? 😭

It depends on how much risk you're able to take. Sometimes volatile means more activity, & greater chance of increased rewards (but also increased risks!)

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