Hi there! Hopefully this helps!
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If the total time he spent on both is <u>45 minutes or more</u>, the answer is:
<em><u>x + y ≥ 45.</u></em>
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Hints for next time
<em>(</em><u><em>≥</em></u><em> Means greater than or equal to.)</em>
<em>(</em><u><em>≤</em></u><em> Means less than or equal to)</em>
<em>(</em><em>></em><em> Greater than)</em>
<em>(</em><em><</em><em> Less than)</em>