emir is standing in a treehouse and looking down at a swingset in the yard next door. the angle of depression from emir's eyeline to the swing set is 31.43°, and emir is 11 feet from the ground. how many feet is the base of the tree from the swingset? round your answer to the nearest foot. 15 feet 20 feet 18 feet 24 feet

The total number of dental clinics total for the last 12 months was recorded

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

(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.)