solve this using pythagorean theorem please and give me the right answer and i will give YOU brainliest and a like in return.

Answer:
answer should be 4.3
Step-by-step explanation:
8.9^(2)-7.8^(2)
=18.37
\sqrt(18.37)
=4.28602379
and round to the nearest tenths should give you 4.3