Tried figuring it out but couldn't anyone think they can ?

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.

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x

Find the interior angle of a regular polygon which has 6 sides