A contractor bought 10.8 ft^2 of sheet metal. has used 2.3 ft^2 so far and has $ worth of sheet metal remaining. The equation 10.8x - 2.3x = 170 represents how much sheet metal is remaining and the cost of the remaining amount. How much does sheet metal cost per square foot? Sheet metal costs $__ per square foot.

(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.)