PART A)The mass of earth is 5.97x10^24 kilograms. The mass of the Moon is 7.34x10^22 kilograms.
What is the combined mass of earth and the moon? In scientific notation

PART B) About how many times as great is the mass of earth than the mass of the moon? In scientific notation

A) When adding numbers in scientific notation, we must be careful of the exponents.

The Moon's mass can be rewritten as .0734 x 10^24 kg

Now we add the Mass of the Earth: 5.97 x 10^24 kg

and that equals 6.0434  x 10^24 kg

HOWEVER, not all those figures are significant and we have to adjust that combined mass to 6.04 x 10^24 kg.

B) Mass Earth / Mass Moon = 5.97 x 10^24 kg / 7.34 x 10^22 kg =

81.3351498638

So, the Earth is about 81 times more massive than the Moon.

Step-by-step explanation:

other answer is correct. i had used the radius of the radius somehow. a website: