The approximate total surface area of Earth is 5.1 x 108 km2. All the salt water on Earth has an approximate surface area of 352,000,000 km2.

All the freshwater on Earth has an approximate surface area of 9 x 106 km2 .
10
How much of Earth’s surface is covered by water, including both salt and fresh
water? Write your answer in scientific notation.

answer: b.36 feet

step-by-step explanation:

answer: 7. if the functions had a negative leading coefficient and is of even degree, which statement about the graph is true?

step-by-step explanation:

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.