Answer:

Step-by-step explanation:
See document
Ok so you divide 80 by 5 to get 16.
Then, you times 16 by the 8 to get your answer
Answer: A straight angle
Step-by-step explanation:
90 + 90 = 180
Answer:
- 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
1
← is the n th term of a geometric series
with a = 1 and r = - 2
The sum to n terms of a geometric series is
= 
= 
= 
= 
= - 85