Final answer:
Ms. Jefferson can fit 7 photos in a row.
Step-by-step explanation:
To determine how many photos can fit in a row, we need to divide the length of the row by the width of each photo. The length of the row is 19 2/5 inches and the width of each photo is 2 3/4 inches.
To divide fractions, we multiply the first fraction by the reciprocal of the second fraction. So, 19 2/5 ÷ 2 3/4 can be written as (19 + 2/5) ÷ (2 + 3/4).
Converting the mixed numbers to improper fractions, we have (97/5) ÷ (11/4). Multiplying the first fraction by the reciprocal of the second fraction, we get (97/5) x (4/11).
Simplifying the fraction, we have 388/55. Therefore, Ms. Jefferson can fit 7 photos in a row.