Will mark brainliest for best answer given

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made. determine an equation to model his situation?

Asap! i'm not good math and i'm lost.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6