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Suppose that income is a function of age. The following function represents the relation between average annual income I and age a. I(a)=52a squared+5113a54,533 (a)

Suppose that income is a function of age. The following function represents the relation between average annual income I and age a.

I(a)=52a squared+5113a54,533

(a) For what age does average income I equal 30,000?

(b) For what age does average income I equal 60,000?

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