exam Maths Puzzle Numerical Ability

Can someone help me on this problem?
I have a problem where we were to discuss a real-life situation where a straight-line graph might be applicable. I used a situation where if

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exam Other Question

determine whether the graph of the polynomial has y-axis symmetry, origin symmetry or neither
f(x)=7-x^4
What expression is equivalent to tan θ-(sec θ/sin θ).

Thank You