exam Maths Puzzle Numerical Ability

What is the second level difference in the sequence generated by the quadratic function tn=-2/3n^2+2n+1 ?

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exam Other Question

I need to know how to solve this problem 125-(-p)=88 . I was told it would be more simple if I changed it to an addition problem and I also need to know how to do that How do you write x^-3/8 in radical form?