What is the cost of a $1200 washing machine after a discount of one fifth the original price

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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.

What is the mean of the data set 125, 141, 213, 155, 281