exam Maths Puzzle Numerical Ability

Help! I have looked at your examples for finding the degree of a polynomial expression but still do not understand. Please help with finding the degree for x^2-x-x^5. Thank you.

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exam Other Question

Solve:
a) logbase3 27+ logbase3 9-logbase3 81= logbase3 x ( I think the answer is 3)
b) logbase2 8 - logbase2 4=x ( I think the answer is 1)
c) logbase5 6- logbase5 x=logbase5 2 ( I think the answer is 3) Write an exponential function y=ab^x whose graph passes through the given points: (2,16), (3,64)