Find the measure of arc ec.
circle a with chords ef and cd that intersect at point g, the measure of arc ec is 5x degrees, the measure of angle egc is 7x degrees, and the measure of arc df is 90 degrees.
50°
70°
100°
140°

answer:   a) 50°

step-by-step explanation:

since the intersection is inside the circle, we add the arcs:

5x + 90° = 14x

        90° = 9x

        10° = x

arc ec = 5x

          = 5(10°)

          = 50°

step-by-step explanation:

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b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.