book Maths Puzzle Numerical Ability

I dont understand how to find the degree of this polynomial. Here is the problem:

42x^12y^3-23x^8y^6

PLEASE HELP!!!

Thanks a bunch!
bye bye now~!~!~!~!~!

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book Other Question

Use transformations of the graph of y=x^4 and y=x^5 to graph:
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