Evaluate the geometric series. Somebody help me please!!!

- 85

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

← is the n th term

with a = 1 and r = - 2

The sum to n terms of a geometric series is

=

    =

    =

    =

    = - 85

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet