Suppose that the domain for x consists of all english text.

p(x): "x is a clear explanation,"

q(x): "x is satisfactory," and

r(x): "x is an excuse,"

express each of these statements using quantifiers, logical connectives, and p (x), q(x),and r(x).

a) some clear explanations are satisfactory

b) all excuses are unsatisfactory

c) some excuses are not clear explanations.

d) does (c) follow from (a) and (b)?