Answer:
a. 135 is correct
Step-by-step explanation:
We have the following information:
dogs lover: 150
cats lover: 120
as the null hypothesis:
H, there are equal number of dogs lover and cats lover, so the expected frequency in each cell will be equal and that is:
f = (150 + 120) / 2
f = 270/2 = 135
so option a. 135 is correct
The answer is 114 to your question
Since we know that law of order states that sum or product of any two specific numbers will be same irrespective to their order.
and
.
Law of order is only applicable for addition and multiplication. It is not applicable to subtraction and division. Let us see it by an example.


Law of grouping states that it does not matter how to order a group of numbers while adding or multiplying.
and
.
Law of grouping is not applicable to subtraction and division. Let us see it by an example.



Therefore, we can see that law of order and law of grouping is not applicable to subtraction.
Now, for a rhombus, all sides are the same length, and the diagonals bisect the vertex they cut, so they cut them in halves, and they also meet at right-angles, and cut each other in halves as well
that means, if the angle is 108, the shorter diagonal will cut that in two equal angles, of 54 each, check the picture below
and since they each other cut in halves where they meet, one side of the shorter diagonal will then be half of 9, or 9/2 or 4.5
since the angle is in degrees, make sure your calculator is in Degree mode