The sales of a certain product after an initial release can be found by the equation S = 16+56
where s represents the total sales and t represents the time in weeks after release. How many weeks will pass before the product sells about 225 units? Round your answer to the nearest week.
I will assume you have a typo and you meant:
S = 16t + 56
so when S = 225
225 = 16t + 56
225 - 56 = 16t
take over