exam Maths Puzzle Numerical Ability

can someone please help me with this question:

If a function has an odd degree and a negative leading coefficient, then what is the minimum number of zeroes it must possess?

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exam Other Question

Solve system by the substitution method and indicate wheter each system is independent, inconsistent or dependent

3y=x+5
3x-9y=-10 Find the value of z, such that P[ -z < Z < z ] = 0.5468

Last one I promise, appreciate all the help you guys have given me to prepare for my tests :)