help with these 6 questions

1. Find the zeros of the polynomial function.

   f(x) = x3 + x2 – 42x

2. Solve and check the linear equation.

    6[-6x + 6 + 4(x + 1)] = 6x + 2

3. Solve and check the linear equation.

    0.40x – 0.20(50 + x) = -0.04(50)

4. Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point.

  f(x) = -x2 – 2x – 6

5. Convert to an exponential equation

     log9 1⁄81= -2

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