Answer:
9a+6b
Step-by-step explanation:
4a+7b+5a-b
First figure out the a's 4a + 5a = 9a
Then do b's (Remember, if there is no number by the letter then it is 1)
7b - 1b = 6b
So for this to be simplified the answer is 9a+6b
2/5 I believe. Correct me if I am wrong
Universe exploded into existence
The answer to that is 2.1
He brought 6 math books and 6 science books
