A rectangle has vertices at (−1, 6), (−1,−2), (3, 6), and (3,−2). Sara says the area of the rectangle is 16 square units and her work is shown. Sara’s Work Step 1: Base: absolute value of negative 1 plus absolute value of 3 is equal to 4 Step 2: Height: absolute value of 6 plus absolute value of negative 2 is equal to 4 Step 3: Area: 4 times 4 is equal to 16 square units Where, if at all, did Sara first make a mistake in finding the area of the rectangle?