Please help, WILL GIVE BRAINLIST

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.

15 point ! ~ see if you know the answer to both you!

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left