Percents are the result of expressing numbers as a part of?

What is the area of the triangle 10 13 12

If you could answer these your a life saver

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.