Can you please help me.​

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.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Find the commission on a $590.00 sale if the commission is 15%.