Question

A theater needs to place seats in rows. The function, f(r) as shown below can be used to determine the number of seats in each row, where r is the row number.
f(1) = 8
f(r) = f(r – 1) + 3
Use the function to complete the table indicating the number of seats in each row for the first four rows of the theater.

Answer 1

The row counts start at eight and count up by three:

$f(1)=8$
$f(2)=f(2-1)+3=f(1)+3=8+3=11$
$f(3)=f(3-1)+3=f(2)+3=11+3=14$
$f(4)=f(4-1)+3=f(3)+3=14+3=17$
.
.
.
and so on.