exam Maths Puzzle Numerical Ability

20. Ken has worked at the same company for many years. The function A(t) gives his annual salary A at any time t, where t is the number of years after 1980.
a. Ken's friend Gabri

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Fill in the table in such a way that when t is the independent variable, the pairing is a function, and when T is the dependent variable, the pairing is not a function. T ? ? ? ?
V ? ? ? ? This is in table form. Find the area of the segment bounded by an arc of measure 80 degrees and the chord which joins the endpoints of the arc in a circle of radius 10 centimeters.