After one customer buys 4 new tires, a garage recycling bin has 20 tires in it. after another customer buys 4 tires, the bin has 24 tires in it.

what is the explicit formula to represent the # of tires in the bin as an arithmetic sequence? and how many tires are in the bin after 9 customers buy all new tires?

Arithmetic sequence formula is:

After 9 customers there are 52 tires in the bin

Step-by-step explanation:

The general arithmetic sequence formula is:

where is the first term, is the nth term, n is the term position and d is the common difference.

Assuming = 20

The second term is 24, then:

d = 24 - 20 = 4

So,  for this case, the arithmetic sequence formula is:

With n = 9:

step-by-step explanation:

10.50 + taxes which added up to 11.50