During the period 1998-2002, the number a (in millions) of books for adults and the number k (in millions) of books for kids sold can be modeled by

a = 9.5t³ - 58t² + 66t + 500 and k = -15t² + 64t + 360

where t is the number of years since 1998.

write and equation that gives the total number (in millions) of books for adults and kids sold as a function of the number of years since 1998.

hint: add the two polynomials together.

about how many books were sold in 2002?

hint: replace t with years and solve to find the answer!