Answer:
a. This is the not the first time that Ricky has lost his temper and gotten frustrated with his family.
b. Ricky easily loses his temper.
Explanation:
The first sentence shows us that Ricky has lost his temper in the past, by using the word "again" the author emphasizes that this is happening one more time. By finding his little brother using his computer "again" we clearly see that very similar situations happened before. This gives us a clue, it seems that this things are very common in his house, therefore he has gotten frustrated in the past.
We can also infer that Ricky loses his temper very easily, he could had managed the situation in another way. However, he got very angry and reacted in a violent way, yelling at his mother and hitting his brother.
In the text we can't see if he wants to control his anger, he never mentions it.
We don't know if he is going to get in trouble as the text doesn't say anything about his mother's reaction. We can expect that in an average family he would get in trouble for what he did, but the passage doesn't give the necessary information.