Answer:
3
Step-by-step explanation:
To find the common ration, we take the 2nd term and divide it by the first term
15/5 = 3
Let check by taking the third term and dividing by the 2nd term
45/15 =3
The common ratio is 3
Answer:
the third one
Step-by-step explanation:
Answer:
6
Step-by-step explanation:
Answer:
-3x+30
Step-by-step explanation:

Expand 

Simplify 

Answer:
x=2
Step-by-step explanation:
6x+11-4x=15
2x+11=15
2x=4
x=2