Algebra
posted by Kareese .
Which of the following equations containing grouping symbols is correct?
A. (6 + 9) − 1 + (4 ÷ 1) = 12
B. 9 + (12 ÷ 4) = 1
C. 24 ÷ (8 + 4) + (16 ÷ 2) = 10
D. (3 − 1) − 2 − (8 − 5) = 12 − 9

A.
6 + 9 = 15
4 ÷ 1 = 4
( 6 + 9 ) − 1 + ( 4 ÷ 1 ) = 12
15  1 + 4 = 12
14 + 4 = 12
18 = 12 FALSE
B.
12 ÷ 4 = 3
9 + ( 12 ÷ 4 ) = 1
9 + 3 = 1
12 = 1 FALSE
C.
8 + 4 = 12
24 ÷ ( 8 + 4 ) = 24 ÷ 12 = 2
( 16 ÷ 2 ) = 8
24 ÷ ( 8 + 4 ) + ( 16 ÷ 2 ) = 10
2 + 8 = 10 Correct
D.
3  1 = 2
8  5 = 3
12  9 = 3
( 3 − 1 ) − 2 − ( 8 − 5 ) = 12 − 9
2  2  3 = 3
0  3 = 3
 3 = 3 False
Ansver : C 
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