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In the United States, the use of lead in paint has been decreasing since its peak around 1920. Congress passed the Lead-Based Paint Poisoning Prevention Act in 1971, and lead in household paint was banned in 1973. The amount of lead used in paint in a certain state can be modeled by
L(t) = 0.00572t2 − 0.85587t + 31.03243

In the United States the use of lead in paint has been decreasing since its peak around 1920 Congress passed the LeadBased Paint Poisoning Prevention Act in 197 class=

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