exam Maths Puzzle Numerical Ability

Simplify completely:

x^4-16 over x^2+4 divided by x^2-7x-18 over 3x^2-15x+18

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exam Other Question

Is the following trinomial a perfect square? Please explain your answer.
x2 + 10x + 25 x punds of candy valued at $3.50 per pound is mixed with y pounds of candy valued at $4.30 per pound to produce 10 pounds of a mixture selling for $4 per pound. Find x and y, the number of pounds of each type.