book Maths Puzzle Numerical Ability

please help me solve this equation:0.8divided by 1/4

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What is the velocity measured in meters per second: v(t)=-9.8t+50. The time in seconds is 2.
I tried using the distance=rate x time: v(2)=-9.8(2)+50
I am not sure if this is the Find a polynomial that represents the area of a circle whose radius is b+1 meters. Using the value of pi=3.14, what would be the radius if the area was to equate 4pi square meters?