
Question 7


A spherical tank of diameter 3 m is filled with water from a pipe of radius 30 cm at 0.2 m per second. Calculate, correct to 3 significant figures, the time, in minutes, it takes to fill the tank. [Take = ].
 When k is added to the expression y2 – 12y, the expression becomes
(y + p)2. Find the values of p and k.





