83.4 Chapter III. First order differential equations of the first degree. Ex. V at page 42

83.4.1 problem 1 (a)
83.4.2 problem 1 (b)
83.4.3 problem 1 (c)
83.4.4 problem 1 (d)
83.4.5 problem 1 (e)
83.4.6 problem 2 (a)
83.4.7 problem 2 (b)
83.4.8 problem 2 (c)