Search our library of All subjects questions

Top answers

All subjects

All levels

Simplify the boolean expression ¬(A.B)+A.

¬(A.B)+A -- given in question. =(¬A+¬B)+A -- using De Morgan's Law. =¬A+¬B+A -- can remove the brackets. =1+¬B -- using identity ¬A+A = 1.=1 -- using identity 1 + anything = 1.

Answered by • Computing tutor

1405 Views

Calculate the file size in bits for a two minute sound recording that has used a sample rate of 1000 Hertz (Hz) and a sample resolution of 5 bits.

First, calculate time in seconds:2 minutes * 60 = 120 secondsFile size (bits) = time (seconds) * sample rate (Hz) * sample resolution (bits)File size = 120 * 1000 * 5 bit...

Answered by James G. • Computing tutor

3132 Views

i) Convert 01101001 from binary to denary. ii) Convert 27 from denary to hexadecimal. ii) State one use of hexadecimal in computing and why it is more beneficial in this application that binary.

i) 01101001₂ = 105₁₀ii) 27₁₀ = 1B₁₆iii) Colour codes, MAC addresses, memory locations, many others.The main advantage of hexadecimal over a number system like b...

Answered by Shafaan J. • Computing tutor

4535 Views

Write a Pseudocode function that returns the factorial of an integer input.

--------------------------------------INPUT XY = 1
WHILE ( X > 1) Y = X * Y X = X - 1
OUTPUT Y-------------------------------It is also possible to complete this task using recursion
DE...

Answered by • Computing tutor

1663 Views

Describe two different functions performed by an operating system [4 marks]

As we can see the question is worth four marks, so we need to identify two functions performed by an operating system, and then be able to give a description of what they actually are. It might be easiest...

Answered by Matthew G. • Computing tutor

5083 Views