exam Maths Puzzle Numerical Ability

Determine any (global) maxima or minima of the function g(x)=x^2-x-20.

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exam Other Question

please to solve this equation written as follows:consider:(x^-4)(x+y+1)and x<-2.
since x<-2,what can your say about(x^-4)?
Which of the given numbers are composite?
a) 15, 49, 55, 87, 91
b) 15, 55, 87, 91, 105
c) 15, 49, 55, 87, 91, 105
d) 15, 49, 55, 87, 105

Can someone help me with this proble