What is the negative x-intercept of the graph of the quadratic function f(x) = 5x2 + 4x - 1?

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What is the measure of angle tvu shown in the diagram below

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer