Can somebody tell me if they’re correct or wrong and please help with 3 and 6 if you can :)

If g(x) is an odd function, which function must be an even function?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables