Carlene is selling t-shirts for a fundraiser. the t-shirts cost $20.50 each. to date, she has raised $700. her goal is to raise more than $8,900. how many more t-shirts, x, does carlene need to sell to reach her goal?

She needs to sell around 397 more shirts. 

Divide 700 by 20.5. This will give you the amount of shirts she has already raised with is 36 (more accurately 36 6/41). Next divide 8900 by 20.5. This is the amount of shirts she needs to sell in total, which is 434. Subtract these two values. 

Hope this helps