A child inflates a balloon, admires it for a while and then lets the air out at a constant rate. If V (1) gives the volume of the balloon at time 1, then the figure below shows V' (t) as a function of t. 3+ V'(t) Ty 8 12 16 20 24 -6- 4 (a) At what time does the child begin to inflate the balloon? The child begins to inflate the balloon at t =

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