Plz help, this is on khan academy

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are 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.)