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Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

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.

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2