18 Here is the graph of = 0.2x2 9x + 7 for 3 y x3 x − − −4 ≤ ≤ (a) Use the graph to find an estimate for the solution of the equation 0.2x2 9x + 7 = x3 − − −5 ....................................................... (2) (b) By drawing a suitable straight line on the grid, find an estimate for the solution of the equation 0.2x2 4x + 7 = 0 x3 − − ....................................................... (3) (Total for Question 18 is 5 marks) ___________________________________________________________________________ The diagram shows a solid cone. 19 The radius of the base of the cone is 5 cm. The total surface area of the cone is cm2 Work out the volume of the cone. Give your answer as a multiple of
18 Here is the graph of y = x3 − 0.2x2 − 9x + 7 for −4 ≤ x ≤ 3 (a) Use the graph to find an estimate for the solution of the equation x3 − 0.2x2 − 9x + 7 = −5 ....................................................... (2) (b) By drawing a suitable straight line on the grid, find an estimate for the solution of the equation x3 − 0.2x2 − 4x + 7 = 0 ....................................................... (3) (Total for Question 18 is 5 marks) ___________________________________________________________________________ 19 The diagram shows a solid cone. The radius of the base of the cone is 5 cm. The total surface area of the cone is cm2 Work out the volume of the cone. Give your answer as a multiple of
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