An online media service offers video and music downloads. each download of a song costs $1. each download of a video cost 3 times as much as the song download. you have a credit of $90. how many songs can you purchase after buying 15 videos?

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

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?