Help pls
my brain hurts

7d²

Step-by-step explanation:

All are like terms. SO combine the like terms

4d² + 9d²  - d² - 2d² + 3d² - 6d² = (4  +9 - 1 - 2 + 3 - 6)d²

                                                    = ( 4 + 9  + 3 - 1 - 2 -6)d²

                                                    = ( 16 - 9)d²

                                                    = 7d²

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

it would rotate about 180 degrees.