exam Maths Puzzle Numerical Ability

How do i simplify (6xy^2)(-8x+ 9y)

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after martha tumble began her job as an editor, she invested in a money market account paying 4.3% interest compounded daily (n=360). What was the effective annual yeild of this account? I need help solving this problem.

Given the standard form for a conic section.

ax^2+by^2+cxy+dx+ey+f=0 and the values a=-5 b=0 c=0 d=16 e=-4 f=-12
Rewrite the equation in s