Math grade 9 , see the photo and solve plzzz i need it very fassttt plzz help

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

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.

Which of the following expressions is equal to 2x^2+8