Book Maths Puzzle Algebra

What is the multiplicity of the root 7 in the polynomial
f(x)= (x-7)^10 (x+2)^3 (x+7)^5?

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Book Other Question

A new car valued at $16,500 depreciates at a steady rate of 12% per year. what is the value of the car in 10 years?

How does this convert algebraically?
6(Z-2)+2Z+7Z+3(Z-2)=0