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The area is given by

24(1/2)(2.5)^2*sin(15)  = 12(2.5)^2*sin(15)  = about 19.4 m^2

10 / √2

To see this....note.....

S^2 + S^2  = D^2

(10 / √2)^2 + (10 / √2)^2 =

100/2   + 100/2 =  100   = D^2

4.54609 Liters

3√2 in simplest radical form

the square root of 18 is 4.24

30 because 3 tens is 30

Pretty funny...NTBMM...!!!

For once.....this actually DOES = "21"

5x^2 -60x+15=0      divide through by 5

x^2 - 12x + 3  = 0    this won't factor, but it does have real solutions

Using the onsite solver, we have

$${{\mathtt{x}}}^{{\mathtt{2}}}{\mathtt{\,-\,}}{\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{x}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}} = {\mathtt{0}} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = {\mathtt{6}}{\mathtt{\,-\,}}{\sqrt{{\mathtt{33}}}}\\
{\mathtt{x}} = {\sqrt{{\mathtt{33}}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{6}}\\
\end{array} \right\} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = {\mathtt{0.255\: \!437\: \!353\: \!461\: \!971\: \!3}}\\
{\mathtt{x}} = {\mathtt{11.744\: \!562\: \!646\: \!538\: \!028\: \!7}}\\
\end{array} \right\}$$

So, to 2 dp ...we have.....x = .26   and x = 11.74

21 lololololol

10% of 2850 is 285

Let's show how we arrived at '15'  as the answer

(4 X 6 ÷ 3) + 9 – 2     work inside the parentheses, first

(24 / 3)  + 9 - 2  =     and once more

(8) + 9 - 2  =       now, we just carry out the additions and subtractions from left to right

17 - 2 =

15 

13.5453177 rounded to the nearest hundreth is, 13.55, the five tells the number in front of it, or the four to go up one.

Write down the decimal divided by 1, so for Example... 0.75/1 Then multiply both the top and the bottom by 10 for every number after the decimal point. If there are 2 numbers after the decimal then use 100, if there are 3 then use 1000, and it goes on like this... Next you want to simplify the fraction. Soo, write down 0.75/1 and multiply both 0.75 and 1 by 100, this would give you 75 over 100. You see, when you multiply 0.75 by 100 it turns it into a whole number, 75. Then you want to simplify the fraction, 75/100 is 15/20 and 15/20 simplified is 3/4. For a three digit decimal you would want to do the same steps as the 2 digit but with 1000 so like 0.625/1, then you do 0.625 times 1000 and 1 times 1000 and so on, there you have it, you have just converted a decimal to a fraction. 

The percent increase is given by [New - Old] / Old x 100%  ..  so we have...

[22 -5] / 5   x 100%  =

17 / 5   x 100% =

[3 + 2/5] x 100% =

3.4  x 100%  =

340%

30 + .40(30) =  30(1 + .40)  = 30(1.4)  = $42

In general, we have

cot(2u)  = [1 - tan^2(u)]/ [2tanu]  

csc(2u)  =   1/[2sinucosu]

So we have

[1 - tan^2(u)]/ [2tanu] + tan(u) =

[1 - tan^2(u) + 2tan^2(u)] / [2tan(u)] =

[1 + tan'^2(u)]/[2tan(u)] =

sec^2(u) / [2tan(u)] =

[1 / cos^2(u)] * (1/2)cos(u)/sin(u) =

(1/2)* 1/ (sin(u)cos(u) =

1/[2sin(u)cos(u)]  = csc(2u)

10 to the power of 10 is 10000000000, you do 10*10*10*10*10*10*10*10*10*10

 Happy birthday.

 so x is equal to 15 

it caused a revolution

Nvm, got it ;D

the anwer is 5

For some reason I can't seem to edit my post, so I'll post this as an answer, just to give more info about my question.

We've only learned about the 3 basic formulas, these:

sin(x-y)=sin(x)cos(y)-cos(x)sin(y)

cos(x-y)=cos(x)cos(y)-sin(x)sin(y)

tan(x-y)=[tan(x)+tan(y)]/[1-tan(x)tan(y)].

(And their x+y counterparts)

Fairly certain I'm supposed to use these, with x-y=5 or x-y=10, x being one of the basic trigonometric numbers (0, 30, 45, 60, 90, 120, 135, 150, 180, 210, 225, 240, 270, 300, 315, 330, 360), and y=a+b or y=a-b in which both a and b are also one of those numbers. Is there a way to easily find out what x, a, and b would be, considering they have to be included in the basic trigonometric numbers?

Could be wrong about this entire theory, though.