This is really hard and I need help on it so can someone tell me the answer???

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

(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.)

50 points~ ! i have to turn this in tomarrow