exam Maths Puzzle Numerical Ability

Can someone help me with this, please show me your steps. Graph the function f(x)=square root x+4, sorry don't know how to type square root.

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exam Other Question

can you help me solve this: [(-1/2)(c^2)(b^3)(a)](2a^2)(b^2)(c^4)

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

y= -(x-2)^2

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