a) 90

b) 95

c) 100

d) 120

step-by-step explanation:

no one knows lol

step-by-step explanation:

C) 100

Step-by-step explanation:

line AC intersects line DB,

hence ∠AEB and ∠DEC are opposite angles and thus

∠AEB = ∠DEC

5x-10 = 4x+12 (subtract 4x from both sides)

5x - 4x - 10 = 12

x - 10 = 12 (add 10 to both sides)

x = 12 + 10 = 22 degrees

∠DEC = 4x+12

= 4(22) + 12

= 88 + 12

= 100 degrees

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