Solving Polynomial Inequalities
1.
In Canada, hundreds of thousands of cubic metres of wood are harvested each year. The function
V (t )  1135t 4  8197t 3  15 868t 2  2157t  176 608, 0  t  4 , models the volume harvested,
in cubic metres, from 1993 to 1997. In which years was less than 185 000 m3 harvested?
2.
Environment Canada records ozone levels across Canada. The number of days, D, ground level ozone
exceeded the national acceptable level of 82 ppb (parts per billion) per hour from 1980 to 1996 can be
approximated by D( x)  0.0007 x  0.0015x  0.0494 x  53162
.
, 0
represented by x = 0. In which years was the number of days less than three?
3
2
x  16 . Here 1980 is