Answer:
30
Explanation:
Write the inequality as 150 + 10w > 450.
Then, solve. Draw a line on the inequality symbol, and cross out the 150. Subtract 150 from the other side. Then, divide the 10w by 10, to get w by itself. Since it's inverse operations, divide 450 by 10 as well.
You will get an answer of w > 30.
Thus, Darla needs 30 more subscribers.