book Maths Puzzle Numerical Ability

Find a counter-example to the statement 4^n+1 is divisible by 5.

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book Other Question

The directions on my paper read: Subtract the sum of the last two polynomials from the sum of the first two. Please help me.

1.) 2x^2-14xy+7y^2
2.) 3x^2-2 This new math sure gets me. I am a senior and trying to answer this question.
[2x(9+7)-4]/7=
Thank you.