A: 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.