The degree of the expression 4 x to the 5th power y to the m th power z is 10 What is the value of m ?

The degree of a monomial is the sum of the exponents on its variables. Here, the exponents are 5 for x, m for y, and 1 for z, so 5 + m + 1 = 10. Solving gives m = 4, which is choice D, 4.

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