Constant coefficient?
g(x)=4x^5+7x-5/9x^4
g(x)=4x^5+7x-5/9x^4
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Yes, it's a polynomial. The degree is just the highest exponent of the polynomial so in this case, it's 5 because of 4x^5. The leading coefficient is the number in front of the variable with the highest degree so 4 again because of 4x^5. The constant coefficient is 0 in this case. If the polynomial were g(x)=4x^5+7x-5/9x^4 + 2, the constant coefficient would be 2. It's basically the number that is being added without a variable.