exam Maths Puzzle Numerical Ability

i need help solving these two equations:
2/3 + 3k/4 +71/12

4 +m/8 =3/4

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exam Other Question

Determine the vertex of y=x^2-8x+22

I have D(4,8) is this correct? Thank you. What is the x-coordinate of the center of the ellipse with the following equation?

(y+6)^2/18+(x-5)^2/4=5