HELP! During the period 1998–2002, the number y (in millions) of juvenile books shipped to bookstores can be modeled by the equation y = -15x^2 + 64x + 360 where x is the number of years since 1998.

During what year were there 400 million juvenile books shipped to bookstores?

The solution to the problem is as follows:

y = -15x^2 + 64x + 360

400 = -15x^2 + 64x + 360

-15x^2 + 64x - 40 = 0

sol ve this for x

x = 3.5

Therefore, rounding up, 400 million juvenile books shipped to bookstores will be in 2003.

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HELP! During the period 1998–2002, the number y (in millions) of juvenile books shipped to bookstores can be modeled by the equation y = -15x^2 + 64x + 360 where x is the number of years since 1998. During what year were there 400 million juvenile books shipped to bookstores?

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HELP! During the period 1998–2002, the number y (in millions) of juvenile books shipped to bookstores can be modeled by the equation y = -15x^2 + 64x + 360 where x is the number of years since 1998.

During what year were there 400 million juvenile books shipped to bookstores?