Several students decide to start a t shirt company. after initial expenses of $280, they purchase each t shirt wholesale for $3.99. they sell each t shirt for $10.99. how many must they sell to break even? a-10 shirts b-20 shirts c- 30 shirts d- 40 shirts

40 shirts

Step-by-step explanation:

The break-even point is that point where the cost and revenue graphs intersect.

Up front, expenditures are $280 + ($3.99)t, and this is to be set equal to revenue:  ($10.99)t:

($10.99)t = $280 + ($3.99)t.

Begin solving this by subtracting ($3.99)t from both sides of this equation.  The result is

($7/shirt)t = $280.

Dividing both sides by ($7/shirt), we get

          $280

t = = 40 shirts

      ($7/shirt)

Revenue will equal costs (expenses) when these students have sold 40 shirts.

y=mx+b is the final answer!   : )