exam Maths Puzzle Numerical Ability

What is the degree of the polynomial:
x^12 - 5x^4

Can anyone help me with the method I am to use please? Thank you so very much!

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exam Other Question

Thank you in advance for your help. It is appreciated. My word problem is: One leg of a right triangle is 4 inches longer than the other leg. If the length of the hypotenuse is 20 inches find the length of each leg. graph the functions.
f(x)= -2x - 5