Let n be a positive integer and let F(n) be the number of factors of n. For example, the number 16 has factors 1,2,4,8,16 and so F(16)=5.
prove that F(n) =< 2√n​

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

54/3 is 18 so 18 is your answer

dont't really have enough info here but its likely

sss for the three sides being congruent ( its stands for side side side)

or

sas   for side angle side.   so a side is congruent and and angle and a side