rule method - writing a common property/a descriptive phrase, and agreeing that those objects, and only those are elments of the sets. ex. rule method X= X is an even number between 25 and 40. roster method X= {26,28,30,32,34,36,38}
7+7+7+7+7+7+7+7 is the same as 7 multiplied by 8, so the answer is 56.
7+7+7+7=28
One way (there may be more) is: 77/7 + 7 + 7 + 7 + 7/7 + 7/7 +7/7 + 7/7 + 7/7 = 11 + 21 + 5 = 37
7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 = 732 = 1104427674243920646305299201
WHAT ARE THE ELMENTS IN KA13Si3013
by their atomic number
15
Actinides family
by the elments an protons
Calcium, carbon and oxygen
nitrogen and oxygen in NO2
alcohols carbohydrates sugars
the periodic table has all the elments
How are elements described in terms of their atoms
They are only two Mercury and Bromine.
Mg2+ and Ca2+ (and many more!)