2040 = n/2(20+(n-1)4)
4080 = n(20+4n-4)
4080= 20n +4n^2 -4n
1020 = 4n + n^2
n^2 +4n -1020 =0
use common formula (can't write out so just look at answers. sorry)
which gives answers of n=-34 and n=30. since n can only be positive, n=30 so there are 30 rows. I liked that challenge
100-15= 85%
2013-2003= 10 years
$71,000 * (0.85^10yrs)= $13,978<span>.</span>08
Did this make sense or would you like me to explain some more about something you are still not understanding? Please comment below :)
Answer:
Step-by-step explanation:
so there’s 25 and 25 it’s kinda like counting money divide it into 4 pieces 25 , 50 , 75 , 100
Answer:
she was left with 28$ I'm in high school i think I'm right
Step-by-step explanation:
