Question

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.

Answer 1

a. 5 to the power of 4 =625 people
b. the 7th round
c. no, the 9th round will reach 1 mil

Answer 2

A: 625
B: 7
C: tamara is incorrect because 78,125 times 5 has to increase by one place value, the hundered thousands, the millions and thats 2 more rounds from 78,125 and so that would be 9 rounds