The sum of four conservative numbers is 230. what is the largest of the numbers

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

Two trains leave stations 546 miles apart at the same time and travel toward each other. one train travels at 95 miles per hour while the other travels at 115 miles per hour l. how long will it take for the two trains to meet

If jobs arrive every 15 seconds on average, what is the probability of waiting more than 30 seconds?