B) -11 - -12 =
e) 18 - 8 =
h) 15- -21 =
k) -17 - -7 =

Good evening ,

Step-by-step explanation:

b) -11 - -12 = -11 + 12 = 12-11=1

e) 18 - 8 = (10+8)-8=10+8-8=10+(8-8)=10+0=10

h) 15- -21 = 15+21=36

k) -17 - -7 = -17+7 = (-10-7)+7=-10+ (-7+7)= -10 +0 =-10.

:)

the circle one

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'.