PERT Test Maths Review

3 is 9% of what number?

.09x = 3 .09x/.09 = 3/.09 x = 3/.09 x = 33

15% of 40

.15 = p/40 × 100 0.15 • 40 = 6.00 6

4 is 20% of what number?

.2x = 4 .2x/.2 = 4/.2 x = 4/.2 x = 20

.2% of 7

0.2 ---> 0.002 0.002 • 7 = 0.014 .014

2x + 3 = -15

2x + 3 = -15 -3 + 2x + 3 = -15 - 3 2x = -18 1/2 • 2x = -18 • 1/2 x = -18/2 = -9

3/x = 5

3/x = 5 x • 3/x = 5 • x 3 = 5x 1/5 • 3 = 5x • 1/5 x = 3/5

5x - 3 - 7x = x + 8

5x - 3 - 7x = x + 8 -2x - 3 = x + 8 -x + (-2)x - 3 = x + 8 - x 3x - 3 = 8 3 + (-3)x - 3 = 8 + 3 -3x = 11 -1/3 • (-3)x = 11 • (-1/3) x = -11/3 = -3 2/3

linear equation

an equation between two or more variables that gives a straight line on a graph

quadratic equation

ax²+bx+c=0

2x² - 7 + 4 = 0

x = -(-7) ± √(-7)² - 4 (2)(4)/2(2) x = -(-7) ± √49 - 32/2(2) x = 7 ± √17/2(2) x = 7 ± √17/4

quadratic formula

x = -b ± √(b² - 4ac)/2a