What is z to the power of 2 equals 1 like I all I need is the numbers for it

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)