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
The average is (0.76+0.88) / 2 = 1.64 / 2 = 0.82
What's the problem about geometry? Which section?
Answer:
22
Step-by-step explanation:
