Sum means to Add.
So the sum of d and 9 would be d + 9
The picture is not opening..
A sports field is 200 feet long.
<span>Thus, we have: </span>
<span>L = 200x, where L is the length of x sport fields.</span>
Very nice handwriting but the math and English are confusing.
Let's assume we're told

The subscript is important.
I think we're told the similar sum with 11 gives the smallest possible value for the sum. This is a rather cagey way of telling us 11 is the mean of the nine points. The mean is the number which minimizes the sum of squared deviations.


If 11 is the mean, the sum of the points is 9(11)=99.

Answer: 1080
23 is 40 degrees
because it’s vertical to angle AOF and when two angels r vertical, they r equal