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Answer:
3.1 feet
Step-by-step explanation:
Use the Pythagorean Theorem to find 0.5x and then multiply it by 2 to find x.
1.4²+b²=2.1²
1.96+b²=4.41
b²=2.45
b=
b≈1.56524758
x≈1.56524758×2
≈3.13049517
≈3.1 ft