What is the next term ofthe sequence 5z, 8x, 11v,...?

Ineed in figuring out this problem.

Which sentence uses an objective tone? we will plant the best garden of any school in the area. the new campus garden will surely be envied by other schools. a garden would provide numerous benefits to the students. you will probably agree that gardens have many benefits.

Why is causation so much more difficult to prove than correlation?