sum of two convolution

If A=conv(s1,s2) gives 5 sets of values and B=conv(s2,s3) gives 6 sets values. Now how to add A and B.

Answer 1

[Image Analyst]

You have to determine what the time (or s) axis is, then expand A on the correct side so that it's 6 elements long. In general, expand the shorter one so it's the same length as the longer one by prepending zeros or appending zeros.