How many 5ths are in 3 3/5

Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. the mean arrival rate is 10 passengers per minutes. compute the following probabilities. p(x = 4) p(x > 11)

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.