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5(3(2+5)-5)

Ok

First add what's inside the parentheses. 

2+5=7  CORRECT

Now use the order of operations to find the answer.

Multiplcation

Division

Addition 

Subtraction

so, you multiply first.

3*7=21        CORRECT

now subtract 5 from 21

21-5=16    CORRECT

Multiply 16 by 5 and you get the answer.

16*5=80        CORRECT

So, $${\mathtt{80}}$$ Is the answer.

CORRECT  CORRECT  CORRECT  CORRECT

EXCELLENT DRAGON      

If you want to put it in gradient and y intercept form then start by multiplying both sides by ab

Ok

First add what's inside the parentheses. 

2+5=7

Now use the order of operations to find the answer.

Multiplcation

Division

Addition 

Subtraction

so, you multiply first.

3*7=21

now subtract 5 from 21

21-5=16

Multiply 16 by 5 and you get the answer.

16*5=80

So, $${\mathtt{80}}$$ Is the answer.

You cannot solve.  There are too many variables.

Hey Dragon,

Why don't you give it a go and i will tell you if you are correct?

So who's correct?

This is a straight forward question.

You just need to know that if a number is followed immediately by a bracket, there is an invisable x sign between them.  

$$\frac{2\sqrt{5}}{\sqrt3-\sqrt7}}\times \frac{\sqrt3+\sqrt7}{\sqrt3+\sqrt7}}$$

That will give you a rational denominator.

$${\frac{{\mathtt{1}}}{{\mathtt{7}}}}{\mathtt{\,\times\,}}{\mathtt{7}} = {\frac{{\mathtt{1}}}{{\mathtt{1}}}}$$

2+3=5

My favorite number is 21, cause that's the date of my birthday!

Multiply m/s x 3600.....this gives you meters per hour.  Then, divide this by 1000 to get km/hr. Then multiply this by .621 to get mph.

add 2.5 to both sides and then multiply both sides by 4

A model of a car has a scale of 1:25. The model is 18 cm long. Calculate, in metres, the actual length of the car

The real one is 25 times bigger.   

Good answers everyone... I should retire... After reading Chapter 2 of A Wizard of Earthsea, I should retire... Melody and CPhill have drawn too much water from the well... Rest my people, rest!...

P is the midpoint of line QR. If PQ=7x - 3 and PR= 2x + 23. What is the length of QR?

Then we have something like this:

Q--------------------------P----------------------------R

       7x - 3                            2x + 23

So PQ = PR   and we have

7x - 3   =   2x + 23       add 3 to both sides    and subtract 2x from both sides

5x  = 26                       divide by 5 on both sides

x = 26/5

So, using one of the equations

7(26/5) - 3  = 33.4 - PQ = PR   and twice this  = QR =  66.8

Greek letters are usually used for angles.  (That is beta)

You use google.  There will be a lot of sites.  Try the 'mathsisfun' site and work through the page.

-5*5*5=-125  

The minus sign is NOT cubed !!

f(x) = sqrt x

$$f(2+h) = \sqrt{2+h}$$

the g function has got nothing to do with it.

1) Prison riddle from Reinout-g   (Thanks Reinout)

It is really good that you talked about your problem.  I want everyone to do that.

But there is no question here.   

You have discovered that on average there was one accident every 4 months.     

That is fantastic presentation Ninja.  

Words like this you are usually best to google.

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