Help these are due today

7.731×10^5

Explanation:

77.31 can not be because the first variable in the scientific notation must be a value between 0-10

thus, the number will be 7.731

77.31×10^4=773100

if the number is 7.73100 then we move the decimal place to the end and count how many places to the right it took

for this instance, the decimal point moved 5 places to the right

therefore, the answer is 7.731×10^5

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.