4- A small ink-blot of area 1 cm and radius r(t) on a piece of absorbent paper spreads in time t sec into a circle where the radius of the circle increases in time as: 1+t² r(t)= 5+t² How long does it take the ink-blot to cover an area of: (a) 1.50 cm² (b) 1.75 cm² (c) 2.00 cm²

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A: Double integers