exam Maths Puzzle Numerical Ability

Find the vertex, line of symmetry, maximum or minimom value of f(x)=1/2(x+4)^2+4

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exam Other Question

trying to figure out how to work the problem out my soultion to #54 was x=-3+/- square root of 14,
#74, my answer came out to be 1+/-i and 8 under the square root,

#108, my answer was x= 4 +/- and 6 under the sqaure root How many kg of water must be evaporated from 50kg of a 10% salt solution to obtain a 15% salt solution?

This was given to me out of a GEPA math tutorial book.