Step 1:

The function is and sec.

Observe the graph:

Two points in the interval are (0, 0) and (2, 10).

Slope = . 

Slope point form of the equation is .

Slope = 5 and the point is (0, 0).

.

Substitute and in above expression.

Volts.

Step 2:

.

Volts.

Step 1:

The function is A and sec.

Observe the graph:

Two points in the interval are (0, 0) and (0.75, 2).

Slope =

Slope .

Point-slope form of the line equation is .

Slope and the point is (0, 0).

For : .

For : 

Find RMS current by using the formula: .

Substitute and in above expression.

A.

From (1)-bit:

For : .

For : .

Find average current by using formula: .

Substitute and in above expression.

A.