David pays a 20% income tax on his $2,100
monthly salary. How
much does he pay in
taxes each year?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

(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.)