Isolating Variables

Solve for x

100

x - 12 = -19

x = -7

200

x + 10 = 15

x = 5

300

-5x + 4 = 6

x = -2/5 or -.4

Brackets

100

3(x + 1) = 12

x = 3

200

2(2x - 4) = 7

x = 15/4 or 3.75

300

3 - 4(x + 6) = 8

x = -29/4 or -8.25

Cross Multiplying

100

x/3 = 7/5

x = 21/5 or 4.2

200

2x/7 = 6/5

x = 42/10 or 4.2

300

(x+3)/4 = 2/9

x = -19/9 or -2.1

Geometry Review

100

What is the area of a circle with diameter of 12 cm.

36 pi cm(2) or 113.04 cm(2)

200

If the circumference of a circle is 20 pi cm, what is the radius?

5 cm

300

A cylinder has a radius of 2 cm and a height of 3 cm, what is the volume?

12 pi cm(3) or 37.68 cm(3)