What is an equation of the line that passes through the points (-5, 1)(−5,1) and (5, 3)(5,3)?

What can be said about the relationship between triangles and circles? check all that apply. a) many circles can be inscribed in a given triangle b) exactly one triangle can be inscribed in a given circle c) exactly one circle can be inscribed in a given triangle d) many triangular shapes can be circumscribed about a given circle

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What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)