Mathmatics Review

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1

Solve of for x

A) x + y + 2 = z
B) x - y = z - 1
C) 2xy = z
D) x/y = z
E) (x+5)/4 - 2 = 4
F) (3x+3)/2 - 2 = 4

...

2

The age of an ultrasound instrument is equal to 3 times its age 3 years from now minus 3 times is age 3 years ago. What is its present age?

3(x+3) - 3(x-3)
= 3x + 9 - 3x + 9
= (3x-3x)+(9+9)
= 0 + 18

= 18