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$$\sqrt{28}=\sqrt{4}*\sqrt{7} = 2\sqrt{7}$$

8*9=72+(7*7) which is 49.

49+72=121

the 4 is not included because the circle is hollow so there is not 'equal to' part.

x can be 5 or  6 or anything bigger than 4 so

x>4

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it should be 3 since 3 is the lowest number that can go into both 

forever  

you usually cannot do this. At least not without doing some work first.

volume = 4500

use pi = 3.14

find r

$$\\Volume=\frac{4}{3}\pi r^3\\\\
4500=\frac{4}{3}*3.14* r^3\\\\
4500\times \frac{3}{4}=\frac{4}{3}*\frac{3}{4}*3.14* r^3\\\\
4500\times \frac{3}{4}= 3.14* r^3\\\\
4500\times \frac{3}{4}\div3.14= 3.14* r^3 \div 3.14\\\\
4500\times \frac{3}{4}\div3.14= r^3 \\\\
r^3=4500\times \frac{3}{4}\div3.14 \\\\
r=(4500\times \frac{3}{4}\div3.14)^{1/3} \\\\$$

You can finish this on the site calc on the home page :)

I need to make a graph for an equation regarding BMI index. How can i solve an equation where a man weighs 85 kg and is between 130 cm and 200 cm? Eventually make graph for it.

Multiply both sides by     5/3 

$$\sqrt[3]{2}\qquad $cannot be simplified$$$

It can however be approximated       2^(1/3)

$${{\mathtt{2}}}^{\left({\frac{{\mathtt{1}}}{{\mathtt{3}}}}\right)} = {\mathtt{1.259\: \!921\: \!049\: \!894\: \!873\: \!2}}$$

subtract 3 from both sides

and then divide both sides by 3

It is just labelled ln

on  the web2 calc hover over the log button and the ln buttoe will appear beneath it :)

zero

It is the x value on the unit circle.  At 90 degrees the x value is 0

F(x)=x+9,where x> 0

it is easier to think if f(x)is changed to a y before we start.

y=x+9   where x>0

Now for the invers function you just swap all the x'es and y's over

x=y+9   where y>0

rearange

y=x-9    where y>0

y is greater than 0 when x>9

so 

y=x-9  where x>9

$$f^{-1}(x)=x-9\qquad $where $x>9$$

I am just presenting it properly now I am on my computer :)

$$\\=\frac{2(p+1)^2-(p-1)^2}{4}\\\\
=\frac{2(p^2+2p+1)-(p^2-2p+1)}{4}\\\\
=\frac{2p^2+4p+2-p^2+2p-1}{4}\\\\
=\frac{p^2+6p+1}{4}$$