In problems 1-3, show that each of the functions on the left is a 2-parameter family of solutions of the differential equation on its right. 1. y = c1 + c2e^-x + x^3/3, y" + y' - x^2 - 2x = 0.

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Which inequalities can be used to find the solution set of the following inequality? check all that apply. |2x – 5| (2x – 5) (2x + 5) –(2x – 5) –(2x + 5)