Chapter 4 Math Review

Writing Expressions

100

a number plus 5

x + 5

200

the product of 5 and a number

300

eight less than twice a number

2x - 8

400

the product of a number and 8, divided by 3

8n/3

500

the quotient of half a number and 5

1/2x / 5

Evaluating Expressions

100

x + 8; x = -4

4

200

-4x; x = -4

16

300

20/2x; x=2

5

400

3x - 4; x= 2.8

4.4

500

 - 15 ( 3 - x); x = -1 

-60

Solving Equations

100

5x = 35

x = 7

200

x / -5 = 2

x = -10

300

6x - 5 = 43

x = 8

400

-2x + 4 = -16

x = 10

500

x/3 - 2 = -10

x = -24

Writing Inequalities

100

Show x < 3

200

How do you know when to do a closed circle and when to do an open circle when graphing inequalities?

300

Show x + 6 > 10

400

Show x/-5 < 3

500

Show -4x + 5 > 21

Solving Inequalities

100

x - 7 < 15

x < 22

200

-3 + x > 20

x > 23

300

7x > -28

x > -4

400

x/-8 < -12

x > 96

500

-6x + 2.1 < -2.1

x > 0.7