What is the sum or difference?1. 3x8 – 7x8 (1 point)–4x16–21x8–4x810x82. 6y5 – 9y5 (1 point)–3y1015y5–54y5–3y5Write 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 polynomial6x2 – 8x + 2; cubic trinomial4. 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