A- m = 5
B- m = - 5
C- m = 4
D- m = - 4
2007-02-05 03:23:05 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
4m + 9 + 5m - 12 = 42
9m - 3 = 42
9m - 3 + 3 = 42 + 3
9m = 45
9m/9 = 45/9
m = 45/9
m = 5
The answer is A) m = 5
- - - - - - - - - - -s-
2007-02-05 07:00:13 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
The answer is A. 4(5) = 20
5(5) = 25 so
20+9+25-12=42
2007-02-05 12:09:27 · answer #2 · answered by Jamie 2 · 0⤊ 0⤋
Start by summing like terms:
m(4+5)+(9-12) = 42 --> 9m-3 = 42
Add 3 to both sides:
9m-3+3 = 42+3 --> 9m = 45
m = 45/9 = 5
So the answer is A.
2007-02-05 12:02:26 · answer #3 · answered by uahgrad05 3 · 1⤊ 0⤋
4m + 9 + 5m - 12 = 42
9m - 3 = 42
9m = 45
m = 5
This is answer A
2007-02-05 12:04:03 · answer #4 · answered by Como 7 · 0⤊ 0⤋