If a > 0 and b < 0, which of the following must be true? A. ab > 0
B. ab < 0
C. a + b > 0
D. a + b < 0

hello :

by applying the distributive property :

6 × 4.3 = 6 × ( 4 + 0.3 )

            =   (6 ×   4) + (6 ×   0.3)

            = 24 + 1.8

6 × 4.3 = 25.8

combine all like terms then its just a 2 step equation