Answer:
Step-by-step explanation:
We have the geometric sequence:
2, 6, 18, 54 ...
And we want to find S8, or the sum of the first eight terms.
The sum of a geometric series is given by:
Where <em>n</em> is the number of terms, <em>a</em> is the first term, and <em>r</em> is the common ratio.
From our sequence, we can see that the first term <em>a</em> is 2.
The common ratio is 3 as each subsequent term is thrice the previous term.
And the number of terms <em>n</em> is 8.
Substitute:
And evaluate. Hence:
The sum of the first eight terms is 6560.
Answer:
A= 2/B= 1/C= 4
Step-by-step explanation:
If a+b equals to 3, then the equation has to be 2+1. Then the value B has to be smaller than C to make a positive number, so B= 1 and C= 4.
Answer:
the sum is 7
Step-by-step explanation:
ik this because i used to be in kindergarten.
Answer:
AC = 5.03
Step-by-step explanation:
tan theta = opposite / adjacent
tan 40 = x /6
Multiply each side by 6
6 tan 40 = x/6 *6
6 tan 40 = x
5.034597787 = x
AC = 5.03 to the nearest hundredth
No 7.1 is a positive number