Just letter answers please

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.

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

If the discriminant if a quadratic equation is 4 which statement describes the roots?