Find ∠AEC in the figure below.

  C. 105°

Step-by-step explanation:

Angles BED and CED are supplementary, so ...

  (2y +x) +(-2y +3x) = 180

  4x = 180

  2x = 90

Substituting this into the expression for angle AEB, we have ...

  Angle AEB = (90 -15)° = 75°

Angle AEC is the supplement to that, so is ...

  ∠AEC = 180° -75° = 105° . . . . . matches choice C

C. 105

Step-by-step explanation:

Adding BED and DEC for being adjacent angles we obtain:

Substituting x in BEA

Adding BEA and AEC for being adjacent angles we obtain:

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

hope this !