Cassie opens a bank account with two dollars. She adds four dollars on Day 1, eight dollars on Day 2, and sixteen dollars on Day 3. She continues this pattern for 15
days.
Which statement describes why this sequence is a function.
Select each correct answer.
The graph of this sequence would pass the horizontal line test.
The graph of this sequence would pass the vertical line test.
Each amount of dollars corresponds to a unique day in this sequence.
None of the above.

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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'.