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8.1

Step-by-step explanation:

Since we dealing with right triangles, we are going to use pythagoern theorem.

+=, where a and b are the two legs and c is the longest side or the slanted side( known as hypotunese.)

Let plug in the numbers

4^2+ b^2=9^2

16+b^2=81

b^2=65

sqr root of 65 is about 8.1

step-by-step explanation:

(s)he  is right it would be 5.5% because it is smaller than 15.5% or anything smaller than 15.5% in general