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very urgent!

consider the function, Z = x²+y²

i need to say i) whether this is continuous

ii) (strictly) increasing or decreasing

i) then establish if the function is a concave, strictly concave, convex or strictly convex function using the typical definition

f[aU + (1-a)V] _> af(U) + (1-a)f(V)

any correspondence before 11.45am GMT would be very appreciated!

ross

consider the function, Z = x²+y²

i need to say i) whether this is continuous

ii) (strictly) increasing or decreasing

i) then establish if the function is a concave, strictly concave, convex or strictly convex function using the typical definition

f[aU + (1-a)V] _> af(U) + (1-a)f(V)

any correspondence before 11.45am GMT would be very appreciated!

ross

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