To find out how many students will attend the field trip, you can calculate 80% of 350 students.
First, convert 80% to a decimal:
\[ 80% = 0.80 \]
Then, multiply this decimal by the total number of students:
\[ 0.80 \times 350 = 280 \]
So, 280 students will attend the field trip.
The answer is e - 280.