Four expressions are shown below:

2(4x + 2)
2(3x + 3)
6x + 6
8x + 4

which two expressions are equivalent to 2(3x + 2 + x)?
a and d
b and d
a and c
c and b

A and D because, 2(4x + 2) is 4x = 12 = 2 = 14 x 2 = 28 and 8x + 4 is 8 x 4 = 32 + 4 = 36 which is 8 more than 28 then, 3x = 9 + 2 + 3 x 2 = 28. 

2(4x + 2) = 28 and 8x + 4 equals 36 which is 8 more and they're both equivalent to 2(3x + 2 + x) because 2(3x = 2 = x) equals 28.