Point A in the xy-coordinate system is shown below. Given two other points B (4a, b) and C (2a, 5b), what is the area of

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A

B

C

D

E

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Point A in the xy-coordinate system is shown below. Given two other points B (4a, b) and C (2a, 5b), what is the area of triangle ABC in terms of a and b?

A. 7ab/2
B. 9ab/2
C. 15ab/2
D. 4ab
E. 6ab

The OA is E

Source: Magoosh