Select the three equations that represent the model. please help, wrong answers will be ignored and if you dont even give me the answer and gimme something like this "gjdsgskd", literally js answering my question w/o a answer, reported all the way..

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

(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.)

What are the triple angle formulas? is it related to double angle identities?