Scuba divers know that the deeper they dive, the more light is absorbed by the water above them. on a dive, petra’s light meter shows that the amount of light available decreases by 10% for every 10 m that she descends. a) write the exponential function that relates the amount, l, as a percent expressed as a decimal, of light available to the depth, d, in 10-m increments. b) what are the domain and range of the function for this situation? c) what percent of light will reach petra if she dives to a depth of 25 m?

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'.