to infer causality, all of the following must be present EXCEPT: Question 1 options: there must be a statistical association between two variables. one variable must occur prior in time to the other variable. there must be a positive relationship between the two variables. all of the other answers state factors that must be present.

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

the answer is c.

step-by-step explanation:

i need more details sorry

step-by-step explanation: