can someone help me with this practice test, it is for advanced functions.

12. Determine algebraically or graphically the intervals when the following function is negative: = x3 - x2 - 16x - 20. Show all steps for full marks. Part B - Thinking and Investigation [TI - 20 marks] 1. Estimate the slope of the tangent to the graph of the function y - 2x' + x" + 23 at x = 2.vv vv 2. The height, A, in metres, of a weather balloon above the ground after : seconds can be modelled by the function h(x) =-20 + 31 + 1497+ 410, for 0 S / $ 10. When is the balloon exactly 980 m above the ground? v vv vv 3. (x- 1) and (x+ 3) are both factors of the polynomial p(x) = ax' + 12x"- 1 1x + b. Find the values of a and b. Page 2 of 54 . Solve the following inequality using an algebraic method Part C - Communication COMM - 20 marks * * * Fully label your graphs for full mark STATE De Determine an equation for the graph of the polynomial function shown Determine an equation in factored form for the polynomial function with zeros 2 ( order 2 ) , 3 , and 3 that passes through the point (1 6 3 . Given the following information about the functiony = Fix ) sketch the shape of the function . ( x - 2 1 2 0 for all x ( * + 1 ) 5 0 for x ( * + 1 30 for so