What are the statements
Answer:
a=7 l=49 Sn=420
Sn=
2
n
[a+l]
So 420×2=n[7+49]
n=15
l=a+(n−1)d
⇒ 49=7+14 d
⇒ 7=1+2 d ⇒ 2d=6
⇒ d=3
It is on the western part of the united states
Andes, Sierra Nevada de Santa Marta and Cordillera Blanca
Explanation:
