Given the arithmetic sequence an = 4 − 3(n − 1), what is the domain for n?

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In the 30-60-90 triangle below side s has a length of and side r has a length

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?