Which functions have at least one real root? Check all that apply
f(x) = -x2 + 10x – 14
f(x) = 2x2 – 12x + 18
f(x) = x2 – 3x + 25
f(x) = -x2 + 4
f(x) = -3x2 + x - 2
f (x) = 10x2 – 4x

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.

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