A) 2d + 3 = 11 → 2d = 8 → d = 4, this is right
B) 11d + 15 → this is an expression, so no
C) 5d + 7 = 27 → 5d = 20 → d = 4, this is right
D) 9 + 2d = 16 → 2d = 7 → d = 3.5, this isn't right
E) 3d = 7 → d = 2.3, this isn't right
That means the answers are A and C
Hope this helps!!