One shelf in the New York Public library can hold 63 books. The New York Public library has 69 books. Enter the number of shelfs needed to store all of the books away.

2 shelves, with a dissapointingly large ammount of empty space on the second one

The number of bacteria, b:

        b(t) = 15t^2 − 60t + 125,

temperature, t:

        t(h) = 3h + 4

Find the number of bacteria in the food in h hours => you need to find b as a function of h, i.e. b(h) =  b[t(h)]

b [t (h)]= 15 [t(h) ]^2 - 60 [t(h)] + 125

     b(h) = 15 [ 3h + 4}^2 - 60 [3h + 4] + 125

     b(h) = 15[9h^2 + 24h + 16] - 180h - 240 + 125

     b(h) = 135h^2 + 360h + 240 - 180h + 125

b(h) = 135h^2 + 180h + 365 < answer