Variables and Expressions Algebra

Identify the terms, coefficients, and constants of the expression. 3r²+4r+8

• Terms: 3r², 4r, 8    Coefficient: 3, 4   Constant 8, 3

• Terms: 3r², 4r, 8    Coefficient: r²     Constant: 8 

• Terms: 3r²     Coefficient: 3, 4, r²     Constant: 8

• Terms: 3r², 4r, 8   Coefficient: 3, 4    Constant: 8

Identify the variables in the following expression: 4x + 2y - 6

• 4, 2, -6

• -4 and x

• X and Y 

• -6

Simplify the expression: 7v + 2 + 12 + 2v

• 23

• 23v

• 9 + 14v

• 9v + 14

Three times a number increased by nine

• 3h-9

• 3(h-9)

• 3(h+9)

• 3h+9

Evaluate 3x - 7 if x = 12

• 305

• 29

A variable is a letter or symbol used to represent an unknown number.

• True

• False

Choose the best choice.

• 1

• 2

• 3

• 4

Evaluate 2ps for
p = 3 and s =5.

•                        6

•                       30

•                      10

•                        23

Evaluate the expression using the given values:

z + y + y

use y = -4, and z = 4

• -7

• 2

• 0

• -4

a symbol for an unknown value; usually a letter (such as a, x, or y) is the symbol used

• constant

• variable

• coefficient

• term