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2
Step-by-step explanation:
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48 out of 50 correct answers
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Answer: 8^3, Eight to the third power, Eight times eight times eight.
Focus on triangles DFC and DFE:
- They are both right triangles because DF is perpendicular to EC
So, the two triangles are congruent. It follows that CF=FE, and in particular

And since x=3, the length of EF is
