- Select the correct difference. -3z^7 - (-5z^7) please help?

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Pleaseeee, can you help me find the asymptote vertical and horizontal? Why do you do tan theta for banked road problems instead of mgsin theta ?? Kb for NH3 is 1.8x10^-5 what is ka for NH4CL? Solve the following partial differential equation for :
du/dx + u = ((cos7x + x^3)/e^x)? Solve cos x + Sqrt (1- 1/2 (sin 2x) = 0 for 0 < x < 2pi?