ABCD is a parallelogram with A(-1; 4), B(3; 6), and D(4; 1): Determine: 3.1 the gradient of AB. 3.2 the midpoint P of BD. 3.3 the coordinates of C. 3.4 the equation of CD. 3.5 the coordinates of E if E is the intercept of the line CD produced. 3.6 the inclination of the line AE. 3.7 the size of AÊD. 3.8 the length of BC.