The capacities at which U. S. nuclear power plants are working are shown in table for various years. Year Percent
1975 56
1980 59
1985 58
1990 70
1995 76
2000 88
2004 89

Let
f
(
t
)
be the capacity (in percent) at which U. S. nuclear power plants are working at t years since 1970. A model of the situation is
f
(
t
)
=
0.027
t
2
+
0.216
t
+
53.296
.

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.