(a)

The function is .

Compare the equation with  is a line passing through origin.

So the function  is a line.

From the graph, it matches with graph  is a line passing through origin.

(b)

The function is .

Compare the equation with  is a exponential function.

Where  is a positive constant.

So the function  is a exponential function.

From the graph, it matches with graph  is a exponential function.

(c)

The function is .

Compare the equation with  is a power function.

Where  is a positive integer.

Here  so the function  is a power function.

It is also a polynomial function of degree 3.

From the graph, it matches with graph  is a power function.

(d)

The function is .

Compare the equation with  is a root function.

Where  is a positive integer.

Here  so the function  is a cube root function.

From the graph, it matches with graph  is a root function.

(a) .

(b) .

(c) .

(d) .