19. Simplify and solve this equation: 4m + 9 + 5m - 12 = 42.
A. m = 5
B. m = -5
C. m = 4
D. m = -4
25 Solve this equation: 2s + s + 12 = 132.
A. s = 120
B. s = 40
C. s = -30
D. s = 9
30. Solve this equation: 80 = 3y + 2y + 4 + 1.
A. y = -15
B. y = 1/5
C. y = 15
D. y = 75
2007-01-29 00:46:11 · 3 answers · asked by Blaze T 2 in Science & Mathematics ➔ Mathematics
4m + 9 + 5m - 12 = 42
9m - 3 = 42
9m - 3 + 3 + 42 + 3
9m = 45
9m/9 = 45/9
m = 5
- - - - - - - -
2s + s + 12 = 132
3s + 12 = 132
3s + 12 - 12 = 132 - 12
3s = 120
3s/3 = 120/3
s = 40
- - - - - - - - -
80 = 3y + 2y + 4 + 1
80 = 5y + 5
80 - 5 = 5y + 5 - 5
75 = 5y
75/5 = 5y/5
75/5 = y
15 = y
- - - - - - - - - - -s-
2007-01-29 01:23:41 · answer #1 · answered by SAMUEL D 7 · 1⤊ 0⤋
question 19- A
4m + 9 + 5m - 12 = 42
9m = 42 + 12 - 9
9m = 45
m = 45/9
m = 5
question 25- B
2s + s + 12 = 132
3s + 12 = 132
3s = 132- 12
3s = 120
s = 120 /3
s= 40
question 30- C
80 = 3y + 2y + 4 + 1
80 - 4 - 1 = 3y + 2y
75 = 5y
y = 75/5
y = 15
2007-01-29 08:58:23 · answer #2 · answered by Kelvin T 2 · 1⤊ 0⤋
5 40 15.
2007-01-29 08:56:00 · answer #3 · answered by hughr k 2 · 0⤊ 1⤋