Final answer:
The expression 3x^4 + 5x - 6x^2 + 10x^3 when arranged in descending order by exponents is 3x^4 + 10x^3 - 6x^2 + 5x. The list of coefficients in descending order is therefore 3, 10, -6, 5.
Step-by-step explanation:
The expression given is 3x^4 + 5x - 6x^2 + 10x^3. When rewritten with terms in descending order by exponents, it becomes 10x^3 - 6x^2 + 3x^4 + 5x.
However, we should place the highest power term first, giving us 3x^4 + 10x^3 - 6x^2 + 5x.
So the coefficients, in descending order, are 3, 10, -6, and 5.