Name the property of real numbers illustrated by the equation.
57. 2(s – t) = 2s – 2t
58. -[-(x – 10)] = x - 10
59. -(2t - 11) = 11 – 2t
- b) = (-1)(a - b)

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?

Determine the area of a triangle with (see picture below)

Astandard doorway measures 6 feet 8 inches by 3 feet. what is the largest dimension that will fit through the doorway without bending?