(1 point) Which of the following differential equations are separable? (Select all that apply.) dy A. -3y d.t VB. dy + 2 y dt Uc. - dy =t+1 dt dy = ty - y dt E. None of the above Now consider the following more general question about differential equations. f'(x) dx - x dx Which of the following functions f(x ) satisfy this equation? (Select all that apply.) A. f(x) = 7x OB. f(a) = 2 +7 Oc. f(x) = 7x2 VD. f(x) = 1x2 - 7 VE. f(x) OF. f(2) = 20 JG. f(x) = -22+7 OH. f(20) = 2- 7 1. None of the above