### All Discussions (31)

### The body is the hero

Hello guys,

I was chatting earlier today and someone told me that science must be considered the hero of our time mainly when it comes to our immune system. Thenceforth, I decided to post exactly what I have learned from the past few days and I hop

Read more…### Geometry (I)

Imagine that we have 2 parallel lines and there are 5 points on each line.

How many triangles can we make by them?

1- 100

2- 200

3- 150

4- 300

Read more…### Let's study "Mathematics" with each other! (8)

**Lim ([x]+[x^2]+…+[x^100])=?** (Where **x****→ō** )

**-50****0****50****100**

### Let's study "Mathematics" with each other! (6)

1.

If:

**f(x)=** ** x , for x≤1 **& ** x^2 ,for x>1**

** **

Then,

What is the **inverse** of **f(x)**?

** **

1- **x , for x≤1 & √x ,for x>1**

2- **-x , for x≤1 & -√x ,for x>1**

3- **1/x , for x≤1 & 1/x^2 ,for x>1**

4- **-1/x , for x≤**

### Let's study "Mathematics" with each other! (5)

If we have:

**f(x)=****√{1-√(x-1)}**

Then,

Which one is the **range** of **f(x)**?

1- **[0,1]**

2- **[0,3/2)**

3- **[1/2,1[**

4- **[1/2,3/2)**

### Let's study "Mathematics" with each other! (7)

1.

**sin-1 x + cos-1 x=?**

** **

1- **π/4**

2- **π**

3- **π/2**

4- **2π**

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

2.

If,

**-π/2 < Ө < π/2**

**Sinhx= tgӨ**

Then,

**Coshx=?**

1- **cos Ө**

2- **csc Ө**

3- **sec Ө**

4- **sin Ө**

** **

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

Read more…### Let's study "Mathematics" with each other! (2)

1-If we have:

**[x]** **≤ (x/2)**

** **

Then which one is right?

1- **{x: x>1}**

2- **{x: x<1}**

3- **{x: -1<x<1}**

4- **{x: -2<x<0}**

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

2-Which one is **odd**?

1- **Ln {x+**√**(1+x ^{2})}**

2- **e^sinx**

3

Read more…### Let's study "Mathematics" with each other!

Hi dear friends!

How are you?

Are you interested in "Math"?!

So…

Let's study it together!

Please answer these questions:

1- If we have:

**1< (2|x|-1)/|x|+1 < 2**

Then;

Which one is right?

1) ** x > 1/2**

2)** -2 < x < 2**

3) ** x < -(1/3) or x > (1/3)**

4

Read more…### Let's study "Mathematics" with each other! (4)

1- If we have:

**f(x)= x ^{^2}+2x**

**g(x)=x ^{^3}**

^{ }

Then, how many answers can **(gof)(x)=(fog)(x)** have?

1- **1**

2- **2**

3- **3**

4- **6**

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

2- If we have:

**f(x)=2[x]+2[-x]**

** **

Then, what is

Read more…### Let's study "Mathematics" with each other! (3)

If we have:

**f(x)= Ln(x^ ^{9)}**

**g(x)=** **x^( ^{2/3)}**

**h(x)= e^( ^{x)}**

Then, what is **f(g(h(x)))**?

1- **6x**

2- **9x**

3- **10x**

4- **e^( ^{9x)}**

### Asteroid Towards Earth

Any idea or information about asteriods chances of hitting earth within a next decade.Sources : NASA Website

Read more…### 6s all around !

Hi you who is interested in mathematics ! I do love it ...So welcome to this session !Stop by to take a look at the lines below to see if you're a talented mathematician !

picture taken from hereDo not get desperate if you couldn't solve the mystery b Read more…### Stay away from aliens??

There has been an interesting debate about our quest for extraterrestrial life forms, since Stephen Hawking, a renowned theoretical physicist, said that if we encounter aliens, they could be more interested in exploiting our natural resources than sh

Read more…### SLEEP STAGES...

Hi everyone ...here is some info about the stages we go through during a sleep period...hope you to enjoy it...**some facts about sleeping...****Complex changes take place in the brain during sleep. It is far from a simple reduction in body process activi**

### It's unbelivable

I took this photo in Sausalito,CA,USA.The man has done this great job in front of our eyes.I really impressed!

Read more…### 1o mens!!Very Important In Technology!!!

1-Sergey Brin and Larry

Sergey Brin and Larry PagegoogleGoogle is now bigger and more controversial than ever as Brin and Page continue to dominate the world of tech.“Obviously everyone wants to be successful, but I want to be looked back on as being Read more…