Answer
a) 1
b) 1
c) 1
d) 0
Work Step by Step
Before starting the problem, consider the domain, all real numbers.
a) $\exists x(x^3=-1)$ is satisfied by $x=-1$, so the statement is true.
b) $\exists x(x^4x)$ is $x=-1$, so the statement is not true.
