Answer:
It is right
Step-by-step explanation:
Because the hypotenuse must be greater than all the legs, we have that
is the hypotenuse. So, we want to determine if
.

This means the triangle is indeed right!
Answer:
One Solution:

Infinitely Many Solution:

No Solution:

Step-by-step explanation:
System 1


Hence only one solution 
System 2

Both represents the same line. Hence these have infinitely many solutions.
System 3

Compare both the lines with
, where m is the slope.
for both the lines.
Hence these two lines are parallel that means there does not exists any point of intersection
So this system will not have any solution.
Perimeter is all sides added up.
Area is sometimes length times width with four sided figures like a rectangle or a square and for like triangles it is base times height.
The sum of 12 and a number
(12 + n)
is no greater
< =
then the sum of twice the number and 8
(2n +(-8)) = (2n - 8)
so we have :
(12 + n) < = (2n - 8)