Evaluate Expressions
Evaluate -9 - 8a when a = -2
7
Solve for x:
x - 18 = -5
x = 13
Kal buys some number of hats. Each hats costs $17 and he spends a total of $204. How many hats did he buy?
Include a unit of measurement ($, feet, points, etc.).
12 hats
10x - 5x + 15x simplifies to 30x
A. True
B. False
B. False
10x - 5x + 15x simplifies to 20x
Which of these is the same as -4(x + 2y)?
A. -4x + 8y
B. -3x - 2y
C. -4y - 8y
D. -3x + 2y
C. -4y - 8y
Evaluate 5x + y when x = 1.9 and y = -13.21.
-3.71
x/12.7 = 16
203.2
Makai starts with some money in his bank account. He then spends $298 on headphones. His new bank account balance is -$56. How much money did he start with?
$242
Simplify:
12x + 3y - 7x + 15x
20x + 3y
Simplify:
3(4x - 12)
12x - 36
or
12x + (-36)
Evaluate 2x - 6x - 3y when x = -1/2 and y = -1.
5
Solve for y:
-3y - 8 = -2
y = -2
Which of these shows the associate property?
A. (x + 3y) + z = 3x + 3y + 3z
B. (x + 3y) + z = z ( x + 3y)
C. (x + 3y) + z = x + (3y + z)
C. (x + 3y) + z = x + (3y + z)
Associative: can change the grouping
12 + 3w - 100 + 4w
7w - 88 or 7w + (-88)
Simplify:
-1.5(2a + 9b)
-3a - 13.5b
or
-3a + (- 13.5b)
Evaluate (x-y)/2 when x = -10 and y = 5.
-7.5 or -7 and 1/2
Solve for w:
4w - 19.8 = 3.12
5.73
Which of these shows the commutative property?
A. abc = bac
B. abc = a + b + c
C. abc = ab + bc + ac
A. abc = bac
Commutative: can change the order
Simplify:
3f + 7.9g - 13g - 1.02f
1.98f - 5.1g or 1.98 + (-5.1g)
-10(3w - 1.25)
-30w + 12.5
Evaulate -4(w + 13.9 - 2z) when w = -0.5 and z = 8
10.4
Solve for z:
(z/3) - 23 = -4
z = 57
Jose buys one movie ticket and some sodas. Each movie ticket costs $17.65 and each soda is $4. Jose spends a total of $29.65. Which equation gives you the number of sodas he bought?
a. 29.65 - 17.65x = 4
b. 17.65 + 4x =29.65
c. 17.65x + 4 = 29.65
b. 17.65 + 4x =29.65
Since x is number of sodas, it is multiplied by the cost of each soda, not the cost of a ticket.
-14.7r + 13 - 22.5 + 1.8r
-12.9r - 9.5. or -12.9r + (-9.5)
-3/4 ( 8a + 1/2)
-6x - 0.375 or -6x + (-0.375)
or
-6x - 3/8 or -6x + (-3/8)