pleas i need answer for the flowing questions:

Chapter 2 Sensors and Actuators

1. A scientific calculator has 5 rows and 9 columns. How many bits required for addressing assuming separate row and column addresses?

2. Your smartphone touch screen implements a 100 x 100 switch array. What is the minimum number of bits that defines the address of each switch assuming separate row and column addresses?

3. A consumer TV with 4K resolution has a screen that contains 3840 by 2160 array of pixels. Each RGB LED can shine at 256 intensity levels. The number of bits required to display a complete image equals ______. ? (Express answer as n.n x 10y)

4. An underwater sonar detects the echo from an object at 100m range. The TOF equals ___ ( x.xx s).

( TOF = 2r/c. In water c=1500 m/s. )