The rectangels the first one and the one belo it
Set the equation equal to 0: r-8 = 0
add 8 to both sides to isolate the variable: r = 8
answer: r = 8
we know that
the graph 1
the domain is all real numbers----------> (-∞,∞)
the range is all real numbers------------> (-∞,∞)
the graph 2
the domain is the interval----------> [-1,5]
the range is is the interval------------> [-1,2]
Answer:

Step-by-step explanation:
Triangle MRN is created by folding an equilateral triangle by half. Since triangle MRN is right triangle, the equilateral triangle must be folded along the height drawn to one side.
In equilateral triangle with side length of a units, the height is
and the height is greater than half the side because

The leg with length x units has the smaller projection (2 units long) than the leg with length y units has (6 units long).
This means the leg with length y units is the height of the equilateral triangle. If the leg with length y units is the height of the equilateral triangle, then the hypotenuse MN = 8 units is the side of the equilateral triangle and lex with length x units is half the side, so x = 4 units.
By the Pythagorean theorem,

Consider the equation

1) First row of the table
Set x=0 and solve as follows:

The answer is y=20 and the pair x-y is (0,20)
2) Second row
Set x=1 and solve, as follows:

The answers are y=10 and (1,10)
3) Third row.
Set y=0 and solve as follows:

The answers are x=2 and (2,0)