First, make all the denominators same.
Then calculate.
Hopefully this helps :D
Answer:
c. 8
Step-by-step explanation:
1) 
2) 
3) 
4) 
Answer:
9
Step-by-step explanation:
To find the common difference, take the second term and subtract the first term
13-4 =9
Lets check:
Take the third term and subtract the second term
22-13 =9
The common difference is 9