Help me with 20,21 and 22

3. solve the given inequality and graph the solution on a number line.

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?

How can you check that you have correctly converted frequencies to relative frequencies?