Rvertices A(0,7), B(5,-5) and C(10,7). The area of △ABC is A.50 B.60 C.80 D.120 E.140 30.△ABC is an isosceles right triangle with ∠B=90°. If A(3,-2),B(2,-1), then AC=… A. 2 B.1 C.2 D.3 E.4 What is the

W A.1 only B. 2only C. 1and3 only D. 2and3 only E. 2 and 3 only PQRS is a rectangle with the points P(-1,0) , Q(2,0) and R(2,3). Then the coordinate of the point S is A.(2,5) B.(1,5) C.(-2,4) D.(-1,3)

Eone real root, find k. A. 14 B.-14 C. 4 D. -4 E.1 The solution set of x2-x=x(x-1) is A. {0} B. {0,-1} C. {1,0} D. R E.∅ The solution set of the quadratic equation 2x2=4x is A. {0} B. {2} C. {0,2} D. (0,2)

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