Question

Solve. 3a+a=? and explain

Answer 1

You can't answer that, because 3 can't be added with a. It could be 3₃ + 19. Who knows!

Answer 2

4a

If it helps, there is actually a 1 before the a. So, the problem reads 3a + 1a. now you just add the 3 and 1 and attach the variable.

Hope this helps