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Answer 1

8.1

Explanation:

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

`a^(2)`+
`b^(2)`=
`c^(2)`, 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