Answer: 
Step-by-step explanation:
Given
The perimeter of one equilateral triangle is P
The lengths of the equilateral triangle are equal
Suppose x is the length of each side

i.e.

The graph of the function f(x)=(x+2)(x+6) is shown
The statement the function is negative for all real values of x where x <-2
You would need to go in the order of pemdas
(0,6)(5,6)
notice how the y values are they same.....this means u have a horizontal line with a 0 slope.
y = 0x + 6...slope intercept form
0x + y = 6 <==== standard form
The set is not closed
Example
-4 * -2 = 8
8 is not a negative integer