I need help with 3 and 4 The one in black is an example the teacher gave me but I still don’t understand

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.

The surface area of the triangular prism is .

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14