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

Wes is mixing peanuts and chocolate pieces. Peanuts sell for $4.50 a pound and the chocolate sells for $6.50 a pound. How many pounds of chocolate mixes with 5 pounds of peanuts to x squared - 2x>24