The question to help my son with his homework is: How many unique numbers can be formed by combining three sets of three digital decimal numbers
Without a decimal point, six can. With a decimal point, eighteen can.
water is formed by combining hydrogen and oxygen ....
oxides
salt and water.
Metal oxides
Orbit
a rectangle
There are 90 of them that can be formed by concatenation (writing them side-by-side). You can, of course, form lots more by using mathematical operations. Foe example, 99 = 387,420.489. Combining factorials and powers will give numbers with more than 2 million digits!
The compound formed is called a polymer. The phenomenon is polymerization.
white
Water/H2O
white