The <u>circle</u> is best described as all the points that are the same distance from a single point as its center.
distance between the midpoint and the border of circle are called <u>radius of circle.</u>
because a circle is special type of ellipse
Answer:

Step-by-step explanation:
Given



Required
Find Y
To do this, we make use of the mid-point formula
i.e.

WX and ZY are the diagonals of the parallelogram.
The mid-point of WX is:


The mid-point of ZY is:

Equate both values of M

Multiply both sides by 2

By comparison:








Hence:

2400 + 100x = 2200 + 120x
2400 - 2200 = 120x - 100x
200 = 20x
200/20 = x
10 = x <== they would have to sell 10 systems