A park in a subdivision is triangular-shaped. Two adjacent sides of the park are 581 feet and 540 feet. The angle between the sides is 83. To the nearest unit, find the area of the park in square yards. Please HELP

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

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Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters