exam Maths Puzzle Numerical Ability

List all numbers for which each rational expression is undefined:

14 over -5y

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exam Other Question

-12 1/5 - 3 3/10

Im Not Quite Sure How To DO This Problem. I know i simplify it first
-12 2/10 - 3 3/10
THEN WHAT???
please help me out and show the steps

THANK YOU
Conner Hi can I have some help finding an equation of the line through (9, 6) and perpendicular to the line passing through (10, 4) and (-9, 0)?