Robert makes $3.50 per hour working at a convenience store. if he gets a bonus of $25 of this week how many hours must he work to make at least $165?

Robert must work a minimum of 40 hours this week. To solve this, you set up an equation. 3.50x+25=165. Subtract 25 from both sides. 3.50=140.
Divide both sides by 3.5, which equals 40.