WHO EVER ANSWERS IT RIGHT I WILL MARK BRANLEIST!!! I HATE MATH!!

Answer:
1) 6.8127*10^16
2) 2.9544*10^24 in scientific notation.
Step-by-step explanation:
for problem 2, I added the four masses and then divided by 4 to get the answer 2.9544*10^24 or 2.9544e24.