Add/Subtract Rational Numbers
85 - 93
-8
4c - 3
When c = -2
-11
5x - 9 - 8x + 4
-3x - 5
What should you remember when you see 2(3x + 7)?
Various
What are equivalent expressions?
Various Answers
23 - (-24)
47
1/3 x + 5
When x = -6
3
What would be a good strategy for combining like terms?
Various
Solve:
-3 (4x + 12)
-12x - 36
A submarine is sitting at 450 feet below sea level. It ascends 185 feet to take readings at a volcanic ridge. After taking readings, it drops 230 feet to collect soil samples. Finally, it rises another 90 feet to avoid the current. Write an expression to show the submarines' final elevation relative to sea level.
-450 + 185 - 230 +90
-8.6 + 7.2
-1.4
0.3 x - 4m
When x = 20 and m = -2
14
1/2 y + 2/3 - 3/4 y - 1/6
-1/4 y + 1/2
Solve:
-4 (1.5y - 3)
-6y + 12
At a football game, the team starts at the 20 yd line. On the 1st play, they lose 12 yards. The next play they gain 4 yds. Finally the quarterback throws a pass for 38 yds. Write and expression and solve what is the total net yardage of the drive?
-12 + 4 + 38
They gain a total of 30 yards.
If a submarine descends 20.6 meters then ascends 5.7 meters. What is the depth of the submarine?
-14.9 Meters
-50 + 5/13 x
When x = -26
-60
3/5 x - 7 - 7/5 x + 4
-4/5 x - 3
Solve:
1/2 ( -14 + 3x)
-7 + 3/2x
Write an expression that represents the weight of an object that weighs 12 pounds and increases 1/2 pound each month. (m)
1/2 m + 12 or 12 + 1/2 m
Mr. Martinez climbs a mountain to an elevation of 135 1/2 meters. He then climbs down 27 1/4 meters to eat lunch. What is the elevation that he is eating lunch?
108 1/4 meters
8.4 n - 3.2 x
When n = 2 and x = 4
4
- 2/3 a + .25b - 4/3 a - 5/8 b
-2a - 3/8 b
Solve:
0.75 ( -6 - 16y + 18)
9 - 12y or -12y +9
Write an expression to determine the total weight of (b) baseballs that weigh 5.25 ounces each and (s) softballs that weigh 6.5 oz each.
5.25b + 6.5s or 6.5s + 5.25b