exam Maths Puzzle Numerical Ability

Find the value of the polynomial.

-x2 + 3x - 1 when x = 4.

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exam Other Question

Now, this last problem is really tricky for me.

Perform the indicated operations:
3√[3] + 2√[27] �√[12] The volume of a right circular cone of radius r and height r is given by V= pi/3 x r^3. How fast is the volume changing with respect to the changes in r when the radius is equal to 2 feet?