Two cars are traveling in the same direction the first car is going 40 mph and the second car is going 55 mph. the first car left 3 hours before the second car. which equation could yhu solve to find how many hours it will take for the second care to catch up?
40t+120=55t
55t+165=40t
55t+3=40t
40t+3=55t

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .