Is going to be 3/3 and I did this
Number 2 is 100 cm
number 3 the height is equal to 5
NUMBER 4 b is equal to 13
X= -10.5+9.5
X=1
I hope that helped:)
The two numbers in each column have to add to 23
So under 7 you write 16, above 4 you write 19, etc
The rule will say x + y = 23
This is an example to show you what it means to be closed:
If you multiply two real numbers, you will get another real number. Since this process is always true, it is said that the real numbers are "closed under the operation of multiplication.
I truly hope this helps!!