Answer: Each dimension would be 21.1875 inches and 2.375 inches respectively.
Explanation:
Since we have given that
Width of a surfboard =

Thickness of a surfboard =

We need to rewrite each dimension as a decimal.
We first write it in improper fraction:
Width becomes

Thickness becomes

Now, we change it into decimal form:

Hence, each dimension would be 21.1875 inches and 2.375 inches respectively.