Chapter 8.3A, Problem 5A

To determine

a.

Whether $f\left(x\right)=2$ for all $x\in R$, is function from the set of real numbers, R, or a subset of R, to R.

To determine

b.

Whether $f\left(x\right)=\sqrt{x}$, is function from the set of real numbers, R, or a subset of R, to R.

To determine

c.

Whether $\left\{\left(x,y\right)|x=y^2,x\ge 0\right\}$, is function from the set of real numbers, R, or a subset of R, to R.

To determine

d.

Whether $\left\{\left(x,y\right)|x=y^3\right\}$, is function from the set of real numbers, R, or a subset of R, to R.