Tamara texted a photo of a dolphin to 5 friends. she asked each of her 5 friends to text the photo to 5 more friends. the photo chain continued with
each person texting the photo to 5 more friends. how many photos of the dolphin will be texted after 4 rounds? write and evaluate an expression that shows the number of photos.
b: if the photo chain continues, in which round will the photo be texted 78,125 times?
c: tamara says her goal is to have the photo texted 1 million times. she says it will at least take until the 10th round. is tamara correct? explain.

i mostly need with part c

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'.

its kinda hard to answer this when we dont have all the information that we need.