I cannot find a place online that I can check my answers?

Question

Do you know anywhere I can go online to check my answers b4 I turn my assignment in?

5t, for t =3

Answer 1

When I was that age. . . we used to ask friends what they got, or just look through it a few times and perhaps try working the problem backwards?  Either that, of you just turn it in and hope you're right.

As you get into more advanced classes, there's nowhere online to go to check your answer if it's not one printed in the back of the book. . . online help really gets to sucking once you're beyond what the majority of the population studies.  You might as well learn how to do this now, because I can tell this isn't going to work reliably (oh, lots of people who know less than you do will always be there to offer their opinion!) much longer for you based on the question it looks like you have.

Answer 2

the answer is 15.  If t=3, and 5t stands for 5 multiplied by 3, the answer is 15.