Answer :

Step-by-step explanation:

use pythagoras theorem

a squared +b squared =c squared

4.12 squared +8 squared =x squared

16.9744+64=x squared

take the square root of 80.9744

x=9
a^2 + b^2 = c^2
8^2 + radical 17^2 = c^2
64 + 17 = c^2
81 = c^2
9 = c
the answer is 9
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