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You can reduce glare in snowy weatuer by?

Compared with the cost of tuition, fees, and books for a traditional college course, the cost of a clep exam is:

A(t)=(t−k)(t−3)(t−6)(t+3) is a polynomial function of tt, where kk is a constant. given that a(2)=0a(2)=0, what is the absolute value of the product of the zeros of aa?