Pls it says what is volume and how is it measured pls

Which point is on the line y=-2+3? (-2,-1) (3,3) (3,-3) (-3,-9)

The sum of two numbers is 86, and their difference is 20. find the two numbers

(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.)