Remove the polynomials that have positive real elements of their roots.
Great Circle Distance
Back to basics 25 - Valid variable names
Replace multiples of 5 with NaN
Damping of Servomotors with Tachometer Feedback
Expand 10^n to Powers of 4
Toads and Frogs Puzzle 2
Nodal Voltage of Resistor Ladder Network
Let's Make A Deal: The Player's Dilemma 2
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