exam Maths Puzzle Numerical Ability

The price of an item is given by p = 2x squared - 100. Find the
polynomial that represents the revenue generated from the sale of x items.

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exam Other Question

30. Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = -3x + 1.
A) y = -3x + 5
B) y = x + 5

C) y = 3x + 5
D) y = - x + 5

Thank you for your time!!!! the volume of a cylinder is 300cm cubed If the height of the cylinder is 15cm how do i calculate the radius