What is the expanded form of the decimal 509.1?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

What is the total surface area of this square pyramid?

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.