d) multiply the functions, start by distributing the (-4x+7)
(2x+3x²-5)(-4x+7)
-8x² - 12x³ + 20x + 14x + 21x² - 35
combine like terms
-12x³ + 13x² + 34x - 35
e) The degree of the answer is the sum of exponents on the largest term, -12x³ is the largest term. The sum of exponents is 3 so It's a third degree polynomial.