If a = 4, b = 9, and c = 3, what is 3/4a - 2/3b + 6c? OPTIONS: 23 24 30 15?

Answer 1

3/4(4)-2/3(9)+6(3)
3-6+18
-3+18
15

Answer 2

Do you mean (3/4a) - (2/3b) + 6c Or, 3 / (4a - 2) / (3b + 6c)? I'll solve both expressions.

1. (3/4a) - (2/3b) + 6c

First: place the values in the expression...

(3/4*4) - (2/3*9) + 6*3
3/16 - 2/27 + 18
= 18.11

2. 3 / (4a - 2) / 3b + 6c

First: place the values in the expression....

3 / (4*4 - 2) / 3*9 + 6*3

3 / (16-2) / (27 + 18)

(3/14) / (45/1)

Sec: you can't divide fractions - multiply the 1st fracton with the reciprocal of the 2nd fraction (flip the fraction: 1/45)...

(3/14)* (1/45)
3/630
= 1/210