Noemi wrote this expression to describe the number of homework problems she has left to do. 30 – h which situation could be described by this expression? a. noemi knows she has 30 homework problems. she does not know how many she has completed. b. noemi knows she has completed 30 homework problems. she does not know how many she has left. c. noemi knows she has completed 30 homework problems. she doesn't know how many she was assigned. d. noemi knows she has 30 homework problems. she knows she has twice as many left.

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'.