kitty<3

Es: 

$${\mathtt{25.5}}{\mathtt{\,\times\,}}{\mathtt{1\,000\,000}} = {\mathtt{25\,500\,000}}$$

Put 205800000000000 into the site calculator and press "Enter."

http://web2.0calc.com/

The square root of 10 is the same as 10^^1/2

So the problem would be rewritten as:

10^^1/2 * 10^⁴

When you multiply exponents with the same base, you add their powers together:

= 10^^{1/2 + 4}

= 10^^9/2

-7x=42

Divide each side by -7 to get x:

-7x/-7 = 42/-7

x = -6

On the site calculator (and just about any calculator) the carrot sign that you used "^" would suffice for the power button.

However, it is also either of the buttons  $${{\mathtt{x}}}^{{\mathtt{2}}}$$ (number squared) , $${{\mathtt{x}}}^{{\mathtt{3}}}$$ (number cubed), or $${{\mathtt{x}}}^{{\mathtt{y}}}$$ (number to any power) in the 5th column from the left on the site calculator:)

Hm...

a = 4, b = 8, c = 10, b = 12, and e = 18 :)

Either press the "sec" button (3rd row, 3rd column) or type in "sec(   )".