Prealgebra Review

Equations

100

2x+4=24

x=10

200

-3x-6=30

x= -12

300

3(2x-5)=15

x=5

400

-1/2(5x-5)=60

x = -23

500

-5(-4x+6) = 85

x = 5.75

Inequalities

100

2x+4 < 20

x < 8

200

3(2x-8) > 30

x>9

300

1/5(10x -5) < 10 

x<5.5

400

-1/4(2x+8) > 20

x < -44

500

-4(-2x+6)≤ 32

x≥7

Systems

100

X=10

Y=2x+4

(10,24)

200

y=20

y=3x+5

(5,20)

300

y=2x+5

y=3x-3

(8,21)

400

y=-x+5

y=5x-10

(2.5,2.5)

500

2x+4y=20

2(x+4)=y

(-1.2,5.6)

Scientific Notation

100

93,000,000

9.3 x 10^7

200

13.4 x 10^4

1.34 x 10^5

300

4 x 10^3 + 5 x 10^4

5.4 x 10^4

400

8 x 10^7 - 4 x 10^6

7.6 x 10^7

500

2x10^4   x  30x10^3

6 x 10^8

Exponents

100

2^4 x 2^7

2^11

200

5^10 /  5^4

5^6

300

(5^4)^5

5^20

400

8^0

1

500

1/(5^2)

5^-2