Note: Ensure you show your formulars and working. Also, note that you can represent the following symbols as follows: ^ for the exponent symbol, x^2 instead of x2 ; 2? as 2^2; division as / or + ; + individually as + or - ; vb as square root of b. Any other symbol that you find difficult can be typed out in words 3.1 Given that a line AB passes through points A (-3, 1) and B (-1, 5): a. Find the gradient of the line AB. (5) b. Find the equation of the line AB. (5) C. Determine the midpoint of AB. (5 ) 3.2 Evaluate the following limits x2-10x+21 a. lim (5) x-3 x2+x-12 2x3-3x-9 b. lim (5) x-1 x2-4x+2