Question

An artist made a sculptor out of rolls of toilet paper. There are 5 rolls in the first row

and 1 additional roll in each subsequent row. How many rolls are in the 16 row?

Answer 1

16th row = 20

Explanation:

You start with 5. That means that a1 = 5

a2 is 1 more making a2 = 6

so

You have an arithmetic progression

d = 1

s = 16

a1 = 5

a16 = 5 + (n - 1) * d

a16 = 5 + (16 - 1)*1

a16 = 5 + 15

a16 = 20