B) distance from the sun:
Mercury is 57 million km
Venus is 108 million km
Earth is 150 million km
Sum of all 3 = 57 + 108 + 150 = 315 million kilometers. Written in scientific notation =3.15x 10^8
C) 150 million x 10 = 1.5 billion kilometers. This would put Earth close to Saturn which is 1.43 billion Kim’s from the sun.
1.5 billion -1.43 billion = 70 million kilometers
Scientific notation = 7x 10 ^6
D) 70 million km / 28,000 = 2,500 hours.
Scientific notation = 2.5x 10^3