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7. Find the derivative of each function. a) f(x)=x3+ 6x-1 b) f(x) = (2x +3)5(x -2)* c)f(x) = Vx3+ 6x +1 8. Calculate f (1) and determine x when f'(x) = 0 for the functions (a) and (b). a). f(x) =x - 5x + 13 b). f(x) = 3x -2cos(x) 9. Find values for the coefficients a, b and c so that the parabola f(x) = ax- + bx + c goes through the point (1,4) and is tangent to the line y = 9x - 13 at the point (3, 14). 10. In problems a b.c find a function f which has the given derivative. (Each problem has several correct answers, just find one of them.) a) f'(x) = 4x + 3 b)f'(x) = 3x- + 8x c). D (f(x)) =12x2 - 7