exam Maths Puzzle Numerical Ability

Can someone help me on this:

I need to determine whether the following is an expression: (Yes or No)

9 + n = t

Thank you,
Lisa

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exam Other Question

3/(x^2+4x+3) - 1/(x^2-9)
=3/(x+1)(x+3)-1/(x-3)(x+3)
=(3((x-3)-1(x+1))/(x+1)(x-3)(x+3)
=3x-3-x-1/(x+1)(x^2-9)
=2x-4/(x^3+x^2-9x-9)
=2(x-2)/(x^3+x^2-9x-9) Suppose Charlie O�Brian hits a baseball straight upward at 150ft/sec from a height of 5 ft.