Use the greatest common factor to write each answer in simplest form what is 2/3•6/7

The graph shows the rate at which paint is used to paint a wall.enter values to complete each statement below based on the graph.when 1 gallon of paint has been used, ( # ) square feet of the wall will be painted.the unit rate is ( # )square feet per gallon.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.