Eight people are boarding an aircraft. two have tickets for first class and board before those in the economy class. in how many ways can the eight people board the aircraft?

Anyone know? will mark brainliest if correct

What are “like terms”? why can we only add like terms?

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?