Several students decide to start a T-shirt company. After initial expenses of $280, they purchase t-shirts wholesale for $3.99. They sell each T-shirt for $10.99. How many must they sell to break even?

First, let's create an expression.

x = # of t-shirts.

$10.99x - ($280 + $3.99x)

Now, let's set our expression equal to 0.

$10.99x - ($280 + $3.99x) = 0

Distribute the negative sign.

$10.99x - $280 - $3.99x = 0

Combine like terms.

$7x - $280 = 0

Add $280 to both sides.

$7x = $280

Divide both sides by $7

x = 40

The students would have to sell 40 t-shirts to break even.

it would be 6xy and -16xy.

6.25 grams

step-by-step explanation: