How do you solve this math problem it is 6/0

You cannot divide a number by zero, so there would not be an answer. For example, if you have six friends, and you try to give each of them no part of a cookie, nothing can be shared because there is no cookie to share with your six friends. 

It's a little confusing, but I hope that helped!

You can't divide by 0 because 6 divided by 0 is 0

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable