How can i solve for the weight for okapi and llamas

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

Which function has the same domain as y=2x

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?