Which of the following data sets represent a function?
{(2,3) , (3,1) , (2,-5)}
{(3,9) , (7,4) , (1,6)}
{(4,3) , (4,2) , (4,1)}
{(7,6) , (6,7) , (7,8)}

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Kathy spent 5/8 of her money on books and another 1/6 of her money on stationeries.what fraction of kathy’s money was left?

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.