Which of the following expressions are equivalent to -3.5(2 – 3n) – 2.5n?
a: -7 – 8n
b: -7 + 8n
c: -7 – 13n
d: -7 – n(10.5 – 2.5)
e : -7+ n(10.5 – 2.5

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

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)

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