1. The approximate total surface area of Earth is 5.1 x 10^8 k^2. All the salt water on Earth has an approximate surface area of 352,000,000 km^2, and all the
freshwater on Earth has an approximate surface area of 9x10^6 km^2. How
much of Earth's surface is covered by water, including both salt and fresh water?
Write your answer in scientific notation.*

2. How much of Earth's surface is covered by land? Write your answer in
scientific notation.
Your answer

answer: 10 meter

step-by-step explanation:

need details

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.

answer: 24

step-by-step explanation: you have to make a list of each of the orders