Answer:
-220
Step-by-step explanation:
Basically if you have an exponent at the end of a 10,

, then in the end the extended notation is going to have 7 zeros. So it'll be 10000000. Then you multiply whats in the rest of the equation together. There's the beginning :) I hope it helps.
So first you divide by 2 from y so it would equal y=4x+2 and the slope is 4 over 1 and the yintercept is (0,2)
Rotational symmetry = 360 / # sides
rotational symmetry = 360 / 9
rotational symmetry = 40 degrees