Roberto has 42 seashells in his case. he put 7 shells in each row. how many rows of shells does he have?

6

Step-by-step explanation:

First, you would split the 42 into groups of 7. There are 6 groups. Another way to solve is division, so 42 divided by 7 which also equals 6.

He has 6 rows of shells.

Step-by-step explanation:42 divided by 7would give you 6.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)