A region is bounded by the curve y = v2 - a and the lines y = -x and the x-axis. The integral expression for the area of the region is of 2 ( v2 - 8 + 20 ) doc of (2 - 3 - y) dy of? (2 - 32 + y) dy of, (v2 -x-x) da Question 42 2 pts A trough 10 ft long and with ends in the form of a trapezoid 6 ft wide on top , 4 ft wide at the bottom and 4 ft high is filled with a liquid weighing 60 lb/ ft3 to a depth of 3 ft . In solving for the force acting on one end of the trough, the area element to be used in the integration is (Let the x-axis coincide with the bottom of the trapezoid.) o ( 2 + 4) dx o (2 + 4) dy o ( 4 + 2) dy o ( ; + 4 ) dy