Verify that parallelogram ABCD with vertices A(-5, -1), B(-9, 6), C(-1, 5), and D(3, is a rhombus by showing that it is a parallelogram with perpendicular diagonals.​

multiplication of the gradients of the two diagonals is equals to -1 if they are perpendicular

1/5^2 = 7.56/45

10 glasses of juice could be made with 5 carrots, 1,500 orange juice, 2,000 papaya juice.