X + 2y + 5z = -17
2x – 3y + 2z = -16
3x + y - z = 3

You can run 4 laps in 10 minutes your friend can run 6 laps in 15 minutes. are these rates proportional

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

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?