Corrine gave music lessons and charged $15.00 for each half hour. at the end of the day, she had given 4 1/2 hours of lessons. how much did corrine earn that day?

Can someone explain to me how to do

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

(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.)