Since you are looking for 1st and 2nd, it would be 10*9 = 90 ways.
2 times 1 is 2*1 = 2. Any number times 1 is itself.
Use the on-site calculator to find the decimals.
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Do you mean like 0.0000000065 - 0.0000000001?
You can do math anytime you want to!
You can use the on-site calculator to solve this for you.
Do you mean 64b*3/4 as in:
(64*3 / 4)*b = ?
$$\sqrt{\frac{17}{49}} \\\\ \frac{\sqrt{17}}{\sqrt{49}} \\\\ \mathbf{\frac{\sqrt{17}}{7}.}$$
What do you mean by eights one whole?
