1. in a music stadium, there are 18 seats in the first row and 21 seats in the second row. the number of seats in a row continues to increase by 3 with each additional row.
(a) write an explicit rule to model the sequence formed by the number of seats in each row. show your work.
(b) use the rule to determine which row has 120 seats. show your work.

, i'm so bad at algebra!

 The next row would be 24 and the 120 row would be 6,480

the answer is 40.

proof:

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.