The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level. In an
earlier study, the population proportion was estimated to be 0.21.
How large a sample would be required in order to estimate the fraction of tenth graders reading at or below the eighth grade level at the 90 %
an confidence level with an error of at most 0.03? Round your answer O up to the next integer.

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.

linear pair postulates