Answer:
x = 46°
Step-by-step explanation:
Since Δ ABC is equilateral then interior angles = 60°
Since CE = DE then Δ CDE is isosceles and the base angles are congruent, so
∠ ECD = = = 74°
BCD is a straight line, then the 3 angles on it sum to 180°, that is
60° + 74° + x = 180°
134° + x = 180° ( subtract 134° from both sides )
x=1.4
Write the equation
Multiply both sides by x
Divide both sides by 4
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3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45
if union, U means plus,+
if intersect means minus, -