7(2 + 6 – 4d) = pl help me I don’t get it

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.