exam Maths Puzzle Numerical Ability

Solve.

Suppose that the cost C, in dollars, of producing x items is given by
C= 2x squared - 20x +3500. How many items can be produced for $9500?

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exam Other Question

Multiply as indicated
{x^ + 6x + 9/x^ - 4 * x - 2/x + 3}
{2y^ - + y - 3/4y^ - 9 * 3y + 3/5y - 5y^}
{y^ = y - 42/y - 3 / y + 7/(y - 3)^}
rewrite the expresion so that all exponents are positive

(-13)^-1