Is ( -5, 6) ( -2, 0) ( 0, 6) ( 0, 2) ( 1, -3) a function

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have