Add the following polynomials. 1. 7x + 3y, 5x-4y and -2x - 8y 2. 9x2 - 2x + 7 and -6x2 + 5x – 8 3. -3a + 2b, 7a + 4b, and 5a – 2b 4. 50 + 3d, -80 – 2d, and 11 c – 7d 5. 18m – 11y and -24m – 7y

Pa help po please​