What is the sum or difference? 1. 3x8 – 7x8 (1 point)–4x16 –21x8 –4x8 10x8 2. 6y5 – 9y5 (1 point)–3y10 15y5 –54y5 –3y5 write the polynomial in standard form. then name the polynomial based on its degree and number of terms. 3. 2 – 11x2 – 8x + 6x2 (1 point)–5x2 – 8x + 2; quadratic trinomial –5x2 – 8x; quadratic binomial –6x2 – 8x – 2; cubic polynomial 6x2 – 8x + 2; cubic trinomial 4. a biologist studied the populations of white-sided jackrabbits and black-tailed jackrabbits over a 5-year period. the biologist modeled the populations, in thousands, with the