Are you sure the options are what u have written above? because sqrt of 5x=sqrt of 5x,
sqrt of 20x=2•sqrt of 5x,and sqrt of 80x= 4•sqrt of 5x..
Answer:
15
Step-by-step explanation:
Use the Pythagorean Thereom:
= +
= 81+144
= 225
= 15
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