The number of seats in row 20 is; 86 seats
<h3>What is the Arithmetic Sequence?</h3>
We are going to use the arithmetic sequence formula since we require the previous term in a sequence.
The arithmetic sequence formula is;
aₙ = a + (n − 1)d,
where;
a is the first term of the sequence
n is the position of the term in the sequence
d is the common difference
aₙ is the nth term of the sequence.
Our sequence is 10, 14, 18, 22 up to row 20.
Using the sequence formula;
a_20 = 10 + (20 − 1)4.
a_20 = 10 + (19* 4)
a_20 = 10 + 76
a_20 = 86.
Thus, the number of seats in row 20 was 86 seats.
Read more about Arithmetic Sequence at; brainly.com/question/6561461