exam Maths Puzzle Numerical Ability

PLEASE HELP !!!!!
Given the constraints 3x + 4y(>=)60, x + 8y(>=)40, 11x +28y(<=)380, x(>=)0,
y(>=)0, the maximum volue of the functione f(x) = 15x + 25y occurs at the corner p

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exam Other Question

Please help me with this one problem! It does not come from a textbook - it comes from a worksheet.

Problem: This function is one-to-one. Find F^-1.

f(x) = 9x/3-x

I rea Show that the number is rational by writing it as a quotient of two integers.

4. 0.37

Any help with this equation would be GREATLY</b> appreciated.