
There was 60 people in the waiting room of a polyclinic. There were 4 times as many males as females.After 18 males and some females entered the examination rooms, there were 3 times as many males as females left in the waiting room. How many females entered the examination rooms?

Determine the equation of the tangent on y=x3-2x2+5 which is through the point (1,4)