Equiv. Exp.
Select all that apply when x = 4.
a. x - 4 = 0 b. 1 + x = 3 c. 5 - x = 2
d. 8 = 2x e. 1/4x = 1 f. x^3 =12
A, D, E
What does 2(x + 3)= ?
2x + 6
Use y = 9x to calculate your pay
y = amount of pay x = Number of hours worked
How many hours did you work if you were paid $63?
Write an equation.
7 hours
Which is an expression?
a. x > 7 b. y - 4 = 2
c. y = 5 d. 3x + 2
D. 3x + 2
What is x if x/3 = 9?
x = 27
Which is an equation?
a. 2b b. 7y - 3
c. n = 4 + k d. x < 8
C. n = 4 + k
Which is equivalent to x + x?
a. x - x b. 2x
c. x + 2 d. x^2
2x
3/8 of students in a high school are 9th graders. How many 9th graders are there if the school has 480 students?
180 9th grade students
What property is being used in 7(3b - 2) = 21b - 14
a. associative b. distributive
c. communicative d. identity
distributive property
Write an equivalent expression for: 30c - 6d
2(15c - 3d)
3(10c - 2d)
6(5c - 1d)
3/8 of students in a high school are 9th graders. If the school has "x" students, write and expression for the number of 9th graders in terms of "x".
3/8x
Randy had 3.7 liters of lemonade into a partially filled pitcher. The pitcher then contained 12.5 liters. Write and solve an equation that represents this sitation.
x + 3.7 = 12.5
x = 12.5 - 3.7 = 8.8 liters of lemonade
Select all expressions that are equivalent to 64x + 4.
a. 4(16x + 1) b. 8(8x + 4)
c. 8(8x + 1/2) d. 2(32x + 2)
A. 4(16x + 1) C. 8(8x + 1/2)
D. 2(32x + 2)
3/8 of the students at a high school are 9th graders. How many students are in the school if 141 of them are 9th graders?
3/8x = 141
x = 141/1 x 8/3
= 1128/3
= 376 total students
Perry earns $18 for each poster he sells. He uses the expression 18x to calculate his earnings, in dollars. What is the meaning of the variable "x" in Perry's expression?
The number of posters he sells.