The mountain trail at Tanner Park is 8 miles long traveling to the top of the mountain and back. Grayson is making his way back
1 answer:
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Answer:
- 1364
Step-by-step explanation:
The n th term of a geometric series is
= a
where a is the first term and r the common ratio
4 ← is an n th term
with a = 4 and r = - 2
The sum to n terms of a geometric series is
=
, thus
=
=
=
=
= - 1364
Formula used = (a + b) (a - b) = a² - b²