exam Maths Puzzle Numerical Ability

draw the solution graph of the system of linear inequalities
x-2y>4 < > underlined
x<4

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exam Other Question

4 times a number, decreased by 2, is 26. Find the number. Solve.

Suppose that the cost C, in dollars, of producing x items is given by
c = 3x squared - 50x + 1800. How many items can be produced for $13,000?