Answer:
Leading coefficient = - 15
Degree = highest power on a variable = 4
Explanation:
It might be easier to see if you rewrote the polynomial in the order it is normally presented.
Highest power goes on the left.
y = -15x4 - 10x^2 - 2x + 9
The leading coefficient (-15) is the number in front of the variable with the highest power (x^4 or 4)
The highest power on a variable is the degree.