Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 2z+4 <= 28 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * z + 4 <= 28         (1)

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    From inequality(1)：
         z ≤ 12

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    The final solution set is :
         z ≤ 12
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 30z+18(2z+4) >= 699 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        30 * z + 18 * ( 2 * z + 4 ) >= 699         (1)

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    From inequality(1)：
         z ≥ 19/2

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    The final solution set is :
         z ≥ 19/2

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