exam Maths Puzzle Numerical Ability

If the lines passing through the points (1,a) and (4,-2) is parallel to the line passing through the points (2,8) and (-7,a+4), what is the value of a?

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exam Other Question

Find the domain and range of the function
f(x)=(x-a)^2+1

Find the equation of the axis of symmetry of the parabola.
f(x)=(x+1)^2+9

Find the zeros of the polynomial function This is a word problem. One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
I do not even know where to begin on this problem. Please Help!!!!!