It would take under minutes it would take seconds please forgive me if this is wrong :(
For sake of convenience, reverse the series, then it would be:
21,19,17.....7
a=21, d = -2,
s(4) = 4/2 (21+15)
s(4)=2(36)
s(4) = 72
Answer:
Step-by-step explanation:
PLUTO ANSWER!
7.04 trillion = 7.04 x 10¹²