A. 42
B. 48
C. 43
D. 49

9514 1404 393

  A)  42°

Step-by-step explanation:

The whole is the sum of the parts. Lines AH and BC cross at right angles, so angle CDE is a right angle. Then angles CDJ and JDE will have a total of 90°.

  ∠CDJ +∠EDJ = 90°

  3x° +(2x +10)° = 90°

  5x = 80 . . . . . . . . . divide by °, collect terms, subtract 10

  x = 16 . . . . . . . . divide by 5

  (2x+10)° = (2(16) +10)° = 42°

Angle EDJ is 42°.

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^