What is work and power formula combined

Idon’t quite understand this problem

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c.the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors