I think that's the element on the second row and the first column which is 15.
Answer:

This is the answer,the option C
Step-by-step explanation:
Addition property of equality
You have to combine like terms, so 3b plus 2b equals 5b and you can't add b to 5a because they aren't defined, therefore th answer is 5a+b.
Answer:
B.15/121
Step-by-step explanation:
total-11
- P(red)= 3/11
- P(blue)=5/11
- P(red+blue)= 3/11*5/11= 15/121