Answer:
A
Step-by-step explanation:
given the sequence above using using two as a first term the only formula fits the sequence above is A
There is a common ratio r between consecutive terms
r = 8 ÷ 2 = 32 ÷ 8 = 128 ÷ 32 = 4
This indicates the sequence is geometric with nth term ( explicit formula )
= a₁
where a₁ is the first term and r the common ratio
Here a₁ = 2 and r = 4 , then
= 2 . → A
-16t^2+400=0
16t^2=400
take square root on both sides.
4t=20
t=20/4
t=5
