exam Maths Puzzle Numerical Ability

I need help solving: 7(over)x^2-7x+10 minus 3(over)x-5.

I need help solving: a(over)a^2-3a x a^2-9(over)6a.

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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 Find The slope and y-intercept of the graph of the equation

y=7x+3