Use calculus strategies taught in grade 12

12. The volume of water, V litres, in a tank t minutes after the tank has started to drain is given by the formula- V(t) = 1000(25 -t2) , Outs5 How fast is the water draining after 2 minutes ? (3 marks) 13. An object starts at t = 0 and moves in a straight line. It's distance, d in metres, from it's starting point at time t seconds is given by the equation - 4t d(t) = 1 + t2 How far is the object from the starting point when it's velocity is 0 m/s. (4 marks)