Term, coefficient, and exponent of -x^2+2x-2x^2-3x+4+x^2

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

(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.)

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6