Answer:
the ans is C..... good luck
Answer:
It goes up by 2 each time
Step-by-step explanation:
Answer:
Step-by-step explanation:
a₁ = 15
a₂/a₁ = 45/15 = 3
a₃/a₂ = 135/45 = 3
...
It is a geometric sequence with a common ratio r=3.
Sum of first 12 terms = a₁·(1-r¹²)/(1-r)
= 15·(1-3¹²)/(1-3)
= 15·(-531,441)/(-2)
= 3,985,800
Answer:
1
Step-by-step explanation:
Multiplying 1 · 1 = 1
