Answer:
72
Step-by-step explanation:
400+40+200+400 +200 +10+400×2+10
Factors of 36 are 18,12,9,6,4,3,2,1
The common factor of 16 and 36 are 4,2,1
Answer: 20
x+y=5
x-y=4
---------
x=4+y
--------
(4+y)+y=5
4+y+y=5
4+2y=5
2y=1
y=0.5
x=4.5
x²-y²=(4.5)²-(0.5)²=20.25-0.25=20