C. 19.42% because you subtract 389.85 from 314.15 which equals 75.7. So then set it up like an algebraic equation. 389.85x=75.7 divide 75.7 by 389.85 to find the decimal. Then you have to move the decimal to the right two places, since it is a percentage. And then round your answer, so c. 19.42% is your answer. Hope this helped! :)
209,767 rounded to the nearest hundred thousand (Or nearest 100,000) is 200,000.
The third equation is the correct one. After 100 years, about 115 grams will remain.
Just means find any whole number inbetween the sets,
1: 3
2: could be anything from 0 to 4
3: -6 or -5
4: -6 or -7
5: -1
6: anything from 1 to 4
A
this is a geometric sequence since there exists a common ratio r between the terms
r = 
= 
= 
= 3
B
to obtain the next term in the sequence multiply the previous term by 3
= 3 
← recursive rule
C
the n th term of a geometric sequence is
= 
where is the first term in the sequence
= 7 × 
← explicit rule
