Answer:
13
Step-by-step explanation:
Factors is a mathematical or statistical term that describes the numbers you multiply to get another number.
Hence, given that Terri should rewrite 7 to the 13th in expanded form,
Then, she should use 13 factors.
All 13 factors are the same thing . . . 7 .
7^13 should be written as 7¹³ .
Therefore: it works like this: 7*7*7*7*7*7*7*7*7*7*7*7*7
Hence, final answer is 13