Which of the following expressions are equivalent to 40x + 30y.

Keep your choice of a major there is probably no single correct choice. a ) to yourself. b) in perspective. c) based solely on the expectations of others. d) all of the answer choices are correct.

How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?

A24-n net force acts on a 8-kg rock. what is the acceleration of the rock?