The Lakewood baseball team is selling T-shirts for a fundraiser. The shirts cost hundred dollars for the printing design and set up plus $10 per shirt. The team is going to sell the shirts for $15 each. How many shirts do they need to sell to break even

To break even, the total revenue must be equal to the total costs.

Total cost = $100 + ($10 per shirt) * x, where x is the number of shirts sold
Total revenue = $15 * x

Setting the two equations equal to each other:

$100 + ($10 * x) = $15 * x

Simplifying:

$100 = $15 * x - $10 * x
$100 = $5 * x
x = $100 / $5
x = 20

The team needs to sell at least 20 shirts to break even.