Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -(1/45)x^2+4x+60 >= 220 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -( 1 / 45 ) * x ^ 2 + 4 * x + 60 >= 220         (1)

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    From inequality(1)：
         60 ≤ x ≤ 120

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    The final solution set is :
         60 ≤ x ≤ 120

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