Answer:
7/10 can't be simplified, 2/10->1/5
Step-by-step explanation:
7/10 cannot be simplified as 7 and 10 don't have any common factors other than 1
2/10 can be simplified by a factor of 2 to get 1/5
Six hundred fifteen thousand and four
Step-by-step explanation:
Both are very correct,

because any number raised to the power of a negative
is given as

if this helped pls give brainliest
55,000,000 is the answer :D