Can you check my answers and with number  3? 1. which expressions are polynomials? select each correct answer. a: 8x2(3^y) < b: 9x2(y/5) c: 3y2(x 1/4) d: 4x2(y^5)< 2. which description is correct for the polynomial 3x3+4x2−7? a: quartic trinomialb: cubic trinomialc: cubic binomial < d: quadratic trinomial3. what is the degree of the polynomial −6x3y2+5x4−7z? 4.simplify.(5x−2+3x2)+(4x+3)a: 3x2+x+5b: 12x4+1c: 3x2+9x−1 < d: 3x2+9x+15. simplify.(5x^2+2x−5)−(3x^2+3x+1)a: 2x^2−5x+4b: 2x^2+5x−4 < c: 2x^2−x−6d: 8x^2+5x−4