Simplify: (2.4) (a - 0.2b + 3.5c) options:

A. 2.4a - 0.48b + 8.4c

B. 2.4a - 4.8b + 84c

C. 2.4a + 2.2b + 5.9c

D. 2.4a - 4.8b + 8.4c

2.4 (a - 0,2b + 3,5c)

Make these decimals fractions:

2,4 = 24/10

0,2 = 2/10

3,5 = 35/10

Simplify

24/10 = 12/5

2/10 = 1/5

35/10 = 7/2

Now,

12/5. (a - b/5 + 7c/2)

Now multiply everything

12/5. a - 12/5. b/5 + 12/5. 7c/2

12a/5 - 12b/25 + 84c/10

Now make the divisions

12/5 = 2,4

12/25 = 4,8

84/10 = 8,4

2,4a - 4,8b + 8,4c

Alternative D.