Solve for t
t\geq 0
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-0.3t\leq 30-30
Subtract 30 from both sides.
-0.3t\leq 0
Subtract 30 from 30 to get 0.
t\geq 0
Product of two numbers is ≤0 if one is ≥0 and the other is ≤0. Since -0.3\leq 0, t must be ≥0.
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