<span>The answer is 15x + 10y ≤ 250 and x + y ≥ 20.. x - the number of long-sleeved shirts. y - the number of short-sleeved shirts. Long-sleeved shirts cost $15 each: 15x. Short-sleeved shirts cost $10 each: 10y. Jacob can spend at most $250: 15x + 10y ≤ 250. He wants to order at least 20 shirts: x + y ≥ 20. Therefore, we have two inequalities: 15x + 10y ≤ 250 and x + y ≥ 20.</span>
