MATH 123 Semester Review

Evaluating Expressions

100

Evaluate 2x - 9 when x = -2

-13

200

Evaluate 2x² - (x + 7) when x = -3

14

300

Evaluate abc when a = -1, b = -2 and c = -3

-6

400

Evaluate f(x) = x⁴ - 3x² + 5 when x = -2 

9

500

Evaluate f(x) = -5x³ - 2x² + 3x - 4 for f(-1)

-4

Solving Linear Equations in 1 variable

100

-4x = -28

x = 7

200

Solve -4x + 3 = -5

x = 2

300

x/-2 + 2 = -2

x = 8

400

Solve  -3x + -2(x - 1) = -6x + 7

x = 5

500

Solve,  x/3  =  (x+3)/-6

x = -1

Solving Linear Inequalities in 1 Variable

100

x + 4 > 1

x > -3

200

2x - 4 > 2

x > 3

300

x/6 + 5 > -2

x > -42

400

-3x - 3 < -15

x > 4

500

-3(x + 7) + 15 < -2(x - 1)

x > -8

Systems of Equations

100

Solve by graphing, 

y = -3x + 1

y = x - 3

(1, -2)

200

Solve by substitution,

y = 4x + 11

-3x + y = 7

(-4, -5)

300

Solve by elimination,

3x + 5y = 11

5x - 5y = 5

(2, 1)

400

Solve by elimination,

6x - 2y = 32

4x - 2y = 18

(7, -5)

500

Solve the System,

10x + 5y = 30

5x - 3y = -7

(1, 4)

System of Inequalities andTriangles

100

Find the measure of angle C of a triangle that has angle A = 18 and angle B = 54.

Angle C = 108

200

Find the missing side measure if triangle ABC is similar to triangle DEF and AB = 4, BC = 9, DE = 3  

x = 12

300

Solve the system of inequalities by graphing, 

y > 3x - 1

y < -1/2 x + 1

see the answer on the board

400

See the problem on the board.

x = 115 degrees

500

See the problem on the board.

x = 22 degrees