They are dense in that between any two decimals you have another one. A much better way to think of it is that a decimal must be either rational or irrational. For example, .34 is certainly rational, but the decimal expansion of square root of 2 goes on forever and is irrational. So a decimal, being either one, must be dense in the reals.
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8.5 is a decimal.
Basically, the higher you get in the atmosphere, the less dense it gets. It's the exosphere.
To express 84.95 as a decimal, you would simply write it as 84.95. In decimal form, the whole number part remains the same, and the fractional part remains as is. Therefore, 84.95 as a decimal is 84.95.
decimal of 43/125 = 0.34443/125:= 43 ÷ 125= 0.344 in decimal
Anything as dense or more dense than the rock. Rocks, sledge hammers, chisels, etc