The square pyramid shown below has a base with sides of 12 units. The vertical height of the pyramid is 15 15
12
What is the length of 8 (the height of one of the triangular faces)?
Round your answer to the nearest tenth.
The length of s is
units

Having a hard time understanding this question (see attachment).

(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.)

Find the solution on the interval [0, 2pi)