3 (a) Complete the table of values for y=x/20(x^2 - 10) . (b) Using a scale of 2 cm to 1 unit on both axes, draw the graph of y=x/20(x^2 - 10) for 0 =< x =< 5. (c) By drawing a tangent, estimate the gradient of the curve at the point where x = 2.5 . (d) Use your graph to solve the equation y=x/20(x^2 - 10) for 0 =< x =< 5. (e) The graph of y = x/20 (x^2 - 10)=0, together with the graph of a straight line L, can be used to solve the equation x^3 + 10x - 80 = 0 for 0 =< x =< 5. (i) Find the equation of line L. (ii) Draw the graph of line L on the grid. (iii) Hence solve the equation x^3 + 10x - 80 = 0 for 0 =< x =< 5.