The equation would be 28/3 because there are 28 students in the class and the ratio of boystogirlsis 3-9 meaning that it is 1/3, which is the same as dividing by 3, so the equation would be 28/3
The fundamental theorem of algebra states that a polynomial of degree has exactly n roots (including complex and multiple). The degree of a polynomial is the highest (non-negative) exponent of the polynomial, in this case is 17 from the term 15x^17.