Question

How high is the stack of the two books? novel and 3/4 inches and dicitonary 41/2

Answer 1

3/4 + 4 1/2 = 5 1/4

If you mean that the dictionary is 41/2 then the answer = 3/4 + 20 1/2 = 21 1/4. That's a big diction though and not likely measured correctly.