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Maths Puzzle
Numerical Ability
How far from an airport can an airplane fly and return in 8 hours, if its outgoing speed is 160 kilometers per hour and its returning speed is 240 kilometers per hour?
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Can you please help to answer the following question:
.
For what values of A there are exactly two real numbers that satisfy the equation:
x^3 + (a-1)x^2 + (9-a)x - 9 = 0
Fin
How do you do problems like this:
-[a(-7)]