SOMEONE PLEASE HELP ME WITH THIS!!
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ILL GIVE YOU BRAINLIST ANSWER!!

Answer:
7.093 cm
Step-by-step explanation:
[tex]4.5^2+x^2=8.4^2[/tex]
[tex]20.25+x^2=70.56[/tex]
[tex]x^2=50.31[/tex]
[tex]\sqrt{50.31}= 7.093[/tex]