Proszę o pomoc ! Pilne !
a)7a+3b+4c+5a-2b-8c
b)2a-4b-5c-6a-3b+2c
c)4a-2b+3-3a+6b-9
d)-4a+5b-7-2a-3b+3
e)3x+5y-4x+6y-7x-9y
f)-5x+2y-4x+5y+6x-3y
g)-2x+3y+3-2y-3x-4+y-4x+2
h)x-2y-4-2x-5+y-3+2x-6y
i)212x-323y-223y-5x+a-13
j) 4,5ab+212ba-527abc-312ba+37cab+acb- abd

(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.)

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs

Which equation can be solved to find x the measure of jk in the apex