Answer:
C.) All squares are rectangles
Step-by-step explanation:
Rectangles
-4 sides
-the length of opposite sides are equal
-the opposite sides are parrallel to each other
-all angles in a rectangle are 90°
Squares have all the characteristics needed in a rectangle
Well from combining I got ㏑(x²+10x+21)/-2
Answer:
A: 0
Step-by-step explanation:
Hopefully this helps!
Answer with Step-by-step explanation:
We have to prove that
is true for all sets A and B
Let 
Then
or 
and
or 
Hence,
Conversely ,Let 
Then x belongs to A and x does not belongs to B then
x belongs to A- B
Or x belongs to A and x belongs to B then x belongs to 
Hence, 
Therefore, 
Answer:
A
Step-by-step explanation: