Answer:
17x^2
Step-by-step explanation:
8x^2-(-9x^2)= 17x^2
+8x-8x
4,000,000,000 meters
4 x 10,000,000,000,000 x 0.0001 = 4,000,000,000 meters
5y=-2x - 3x
5y = -5x
5y + 5x = 0
5(y + x ) = 0
maybe
