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Workbook

5
g) All real numbers greater than h) All real numbers not less than 2
2

i) All real numbers between -7 and -1 j) All real numbers between -3 and 0,inclusive

2) Write an expression in words that describes the set of numbers given by each interval.

a) ,  4


b) 2,

c)  2,7 

d)  , 

3) Let A  x x    3 , B  x x 0 , C  x  1 x   4 and D  x 1 x 3  

Graph the sets described here. Then express the answer in set-builder notation and interval notation.

B
B
a)A  b) A 

c) B C d)B C

e)C D f)C D

D
D
g)B  h)A 
4) A pH scale determines whether a solution is acidic or alkaline. The pH scale runs from 0 to 14, with 0
being the most acidic and 14 being the most alkaline. A pH of 7 is neutral (distilled water has a pH of 7).

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