exam Maths Puzzle Numerical Ability

Please help me solve this equation: f(x,y)= 4+ x-2y over 2
y

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exam Other Question

Please help me with this problem.
Use the given trigonometric value to evaluate the indicated expression.
If sin(t)=14/19, find sin(t-2pi). Under which of the following conditions of k will this quadratic, x^2 + 8x + k - 0, have real-number, but unequal roots?