What do the double brackets with an x in the middle mean?

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

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?

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation