Answer:
Step-by-step explanation:
Step-by-step explanation:look at the GCF and factor.
Both 3 and 15 share the GCF of 5. And both expressions share the two variables x and y.
2x + 3x + 5x = 180
10x = 180
x = 18
2x = 36, 3x = 54, 5x = 90
They add up to 180 (definition of sum of angles of a triangle.)
X and y are the numbers
y>x
sum (addition) of twice a number (2x) and larger number (y) is (=) 145
2x+y=145
difference between them is 55 (y is bigger so it would be x is subtracted from y)
y-x=55
so the equations are
2x+y=145 and
y-x=55
we could add x to both sides in the 2nd equation to obtain
y=x+55, but that doesn't really represent that the difference is 55, though they are the same euation
so I would say C and D only
<h3>
Answer: 0</h3>
The discriminant is the number under the square root of the quadratic formula
The discriminant formula is 
If D = 0, then the whole square root portion is 0 meaning we end up with the solution 
