3/4 of a number is 21. what is the number. tell me what to do in steps to find the answer, i want to know how to solve these problems, in kid form. work will be appreciated as soon as possible! : )

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

How many terms does the polynomial x^2 y^2 have

(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.)