exam Maths Puzzle Numerical Ability

Which point is not a corner of the feasible region of the system of inequalities:


x+2y £ 10
3x + y £ 10
x ³ 0, y ³ 0



Write the initial simplex tableau of the fo

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I am not sure if I have the right answer. use f(x) = 5^x find x
f(x)=- 1/125
5^x = -5^-3
x=3
(sin(x+pi))/(cos(x-pi))