exam Maths Puzzle Numerical Ability

Would someone please show the graph and whether concave up or concave down?

y= -(x-2)^2

y= -(x^2-4x+4)

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exam Other Question

hi,

true or false: you can multiply a 2*2 matrix by any matrix? true or false? thank you!!
The emergency room at victory hospital employs eight male and ten female nurses. A special triage unit of six nurses is being formed. In how many ways can this be done if :

a) T