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quiz1_sol

# quiz1_sol - FALSE ∈ N N = 1 2 3 4 5(b TRUE or FALSE √ 4...

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Solutions to Quiz 1 1. Write the expression without absolute value bars. (a) | x | x where x 6 = 0 | x | x = 1 x x if x > 0 - x if x < 0 = x x if x > 0 - x x if x < 0 = 1 if x > 0 - 1 if x < 0 (b) -| 1 - 2 | Since 1 - 2 < 0 then | 1 - 2 | = - (1 - 2) = 2 - 1. Thus, -| 1 - 2 | = - ( 2 - 1) = 1 - 2 2. Use interval notation to describe the following: (a) x is at least 3 [3 , ) (b) - 2 x < 3 [ - 2 , 3) 3. Circle true or false. If the statement is false, then state why. (a) TRUE or
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Unformatted text preview: FALSE ∈ N N = { 1 , 2 , 3 , 4 , 5 ,... } (b) TRUE or FALSE √ 4 2 ∈ Z √ 4 2 = 1 ∈ Z (c) TRUE or FALSE Every integer is a rational number. The integers are a subsets of rational numbers. (d) TRUE or FALSE Every whole number is an irrational number. Every whole number is a rational number...
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