Answer:

Step-by-step explanation:
Assuming the geometric series is

then nth term is
,
and the first term is found when
:

The answer is SR=3
2x+23+x+21=14
Solve for x you get
x=-10
Substitute x
2(-10)+23=3
Answer:
21
Step-by-step explanation:
4x and 84 share the same value, so divide 84 by 4 to get the value of x
Answer:
r = 13
Step-by-step explanation:
these angles are vertical and are congruent
8r + 6 = 9r - 7
6 = r - 7
13 = r