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01-08-2018
Mathematics

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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

Respuesta :

a5904640 a5904640

01-08-2018

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.

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