MaxWong

Btw the person from #7, are you a Hongkonger like me?

Your surname tells me that you are a Chinese and most likely, a Malaysian-Chinese or a Hongkonger.

Nope.

One day I feel that my Maths teacher is so bad at teaching and I start to self-study and I still get high grades/marks. 

Then I start to think that self-study is fun, everyone is asking me how did I get high marks with that teacher teaching me. And then I start to self-study some maths which is not in my syllabus. I am now learning Calculus and I am just 14 :)

Don't spam the '2's!!

2 divided by 9 = \(\dfrac{2}{9}\)

heh heh.

No one have given a name to the fourth power.

I suggest a name of 'tesseracted' because a 'tesseract' is a 4-dimensional version of a 'cube'.

Four billion, eight hundred million 

OR

Four point eight billion.

Firstly, question in the title, 10 x 10 = 100

Secondly, the equation:

3x - 5 = 10

3x = 15

x = 5

1 complete revolution means you have to find the circumference of the bicycle tyre.

Assume that the bicycle tyre is a circle.

Circumference of the bicycle tyre 

= 2 x pi x 40 cm

= 80 pi cm.

Therefore the bicycle has travelled 80 pi cm.

slope-intercept form have a form of y = mx + b.

Example: Change 2x + y = 1 into slope intercept form.
2x + y = 1

y = -2x + 1 <-- final answer.

Example 2: Turn 5x + 3 = 2y into slope-intercept form.

5x + 3 = 2y

y = (5x+3)/2 = 5x/2 + 3/2 <-- final answer,

1/2 x 12 x 9 

= 6 x 9

= 54 :)

FYI: If a number is divisible by 9, the sum of all its digit is divisible by 9

        If a number is divisible by 4, the last 2 digits is divisible by 4

************************************************************************************************************

Because 56 is divisible by 4, 12ab56 must be divisible by 4 no matter what a and b is.

1 + 2 + a + b + 5 + 6 = 9x

14 + a + b = 9x

9x may be 18 or 27.

Let's first consider the case of 9x = 18.

14 + a + b = 18

a + b = 4  <---- This is easy maths.

a = 1 or b = 3

OR

a = 2 or b = 2

OR 

a = 3 or b = 1

3 possibilities of a + b. Then we add them up:

3(a + b)

= 3(4) <---- because each pair of a + b in this consideration adds up to 4.

= 12. 

Now consider the case of 9x = 27

14 + a + b = 27

a + b = 13 <----- This is still easy maths.

a = 4 or b = 9

OR

a = 5 or b = 8

OR

a = 6 or b = 7

OR

a = 7 or b = 6

OR

a = 8 or b = 5

OR

a = 9 or b = 4

6 possibilities of a + b. Then add them up again:

6(a + b)

= 6(13)

= 78

Now we add up the number we got in last part and we get in this part.

12 + 78 = 90. Final answer.