The sum of the first 8 terms of a geometric sequence with 4 as the first term and a common ratio of 3 is

Mathematics

2 answers:

ki77a [65]2 years ago

7 0

9514 1404 393

Answer:

13120

Step-by-step explanation:

The sum of terms of a geometric series is ...

Sn = a1·(r^n -1)/(r -1)

You have n=8, a1=4, r=3, so the sum is ...

S8 = 4·(3^8 -1)/(3 -1) = 2(3^8 -1) = 13,120

olya-2409 [2.1K]2 years ago

6 0

Answer:

Step-by-step explanation:

hope it helps u too

You might be interested in

In the rhombus m<1 =160. What are m<2 and m<3? The diagram isn't drawn to scale

Zolol [24]

A rhombus is a parallelogram with four equal sides and two sets of equal angles.

If the m<1=160°, then the angle opposite (3) would also be 160°.

m<3=160°.

Becuase it is a parallelogram, the sum of the measurment of two angles that share a line would be 180 (supplementary).

m<2 and m<4 is 20°.

5 0

3 years ago

Mrs. Simpson drove 105 miles in 2 1/2 hours. What was Mrs. Simpson's average speed in miles per hour?

harkovskaia [24]

105 m = 2.5 h

x miles = 1 hour

You cross multiply since it's a proportion:
2.5 * x
105 * 1

=

2.5x = 105

Then you divide everything by 2.5

The answer is 42

5 0

3 years ago

Read 2 more answers

If a bill cost $125. And they leave a $21.25 for a tip what percentage did they tip

yanalaym [24]

Answer:

17%

Step-by-step explanation:

Divide $21.25 by $125

6 0

3 years ago

Calculate the distance between the points C = (0,-2) and L= (-4, 1) in the coordinate plane. Give an exact answer. (not a decima