Customers arrive at a single self-serve coffee machine in a busy mall at the rate of 20 per hour, following Poisson distribution. Each customer takes exactly 90 seconds to get his or her coffee. What is the expected number of customers in queue at this coffee machine?

Tom and carol are resident aliens, married, and want to file a joint return. they have two children. sydney is 5 years old and a resident alien. benjamin is 2 years old and a u. s. citizen. both children lived with the parents in the united states all year. tom, carol, and sydney have individual taxpayer identification numbers (itins). benjamin has a social security number. tom earned $30,000 in wages. carol had $8,000 in wage income. they had no other income. tom and carol provided all the support for sydney and benjamin. sydney and benjamin attended daycare while tom and carol were at work. tom and carol did not receive dependent care benefits from a dependent care benefits plan or flexible spending account. the daycare center provided the baker's with a statement indicating the amount of $3,250 paid for 2018, their name, address and valid employer identification number. 6. who can tom and carol claim as a qualifying child for the child tax credit? a. sydney b. benjamin c. both sydney and benjamin d. neither sydney or benjamin