Please help with this simple attachment Extremely Easy!

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.

Find the quotient. 50a2 – 98b2 -5a +7b

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction