Koby can work about 22 math problems in 30 minutes. at this rate, how many math problems can koby work in 3 hours

Which value of c would make he following expression completely factored? 8x+cy

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?