Some Solution

FORM 4. CHAPTER 9

9.4 RATE OF CHANGE

PAGE 211 : PRACTICE 19

A container in the form of an inverted cone is being

filled with water at a rate of 8 cm³/s. The cone has a

radius of 20 cm and a height of 30 cm. Find the rate

of change of the height of the water level when the

water level is 5 cm.

LOCUS

Point P(x, y) moves in such a way that its distance from point Q(3,1) is always two times its perpendicular distance from the straight line x = -1 Find the equation of the locus of the moving point P