Mr smith bought x number of shirts for the new members of her chorus. the cost for x number of shirts, including $3.99 shipping was $77.49. each shirt cost $12.25. there was no sales tax on this purchase. which equation could be used to find x?

We are given that the cost of each shirt = $12.25

It is given that she bought total 'x' shirts, each of cost $12,25.

So, the cost of 'x' shirts is  dollars

Also, there is a shipping charge of $3.99

So, the total cost of 'x' shirts is

Since, the shirts cost her total $77.49.

We have the equation,

12.25x + 3.99 = 77.49