Constance is constructing a perpendicular bisector using a compass and a straightedge.
what is the least number of a arcs constance needs to draw to complete the construction?
a) 1
b) 2
c) 3
d) 4
need

With number 11 ( show how you got the answer)

(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.)

Could someone me with this question i’ve been stuck on it for 20 minutes