The product of 5 and an odd number will end in what value?

Aregular polygon has angkes of size 150° each.how many side has the polygon

Ineed the answer to question 1 , i’m desperate

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?