A school pays $1825 for 150 shirts. This includes the $25 flat-rate shipping cost. What equation models the total cost as a function of the number of T-shirts ordered?

Answer: 12n + 25

Step-by-step explanation:

Let x represent the amount that the school pays for ordering one shirt.

This includes the $25 flat-rate shipping cost. This means that if n shirts are ordered, the total cost including shipping would be expressed as

nx + 25

The school pays $1825 for 150 shirts. The expression would be

150x + 25 = 1825

150x = 1825 - 25

150x = 1800

x = 1800/150

x = $12

Therefore, the equation that models the total cost as a function of the number of n T-shirts ordered is

12n + 25