Background: Hex numbers use the digits 0 through 9 just like decimal numbers do, but they need to be able to express 16 possible values for each digit, and the 10 numerals we are used to dealing with every day just are not enough. Hex digits also encompass the Roman alphabet letters A - F, where A = 10 through F = 15. These letters usually are written as capitals, but this isn’t a requirement. In hex, each digit can stand for anything from decimal 0 to decimal 15. Two hex digits are the equivalent of eight digits of binary. In other words, it takes only two hex digits to write one byte or 8 bits. For example, “0x14” in hex equals “20” in decimal notation. What is the value of 0x22 in decimal?

Analyze the following statements. If the first two statements are true what can be said about the third statement? Use only the information provided here. 

Statement 1: Modern computers often use SSD drives. 

Statement 2: Older computers often use spinning hard drives. 

Statement 3: Most computers use flash memory. What can be said about the third statement?

On a network, each computer has a special address called an IP address. In IPv4 the addresses must take the form [0-255].[0-255].[0-255].[0-255]. A valid IPv4 address for example is '192.168.13.2'.Look at the below blocks of IP addresses. Which block, if any, contains an invalid IP address?

In a computer program, valid combinations of data are 5 characters long, which start with a letter and finish with a letter. In between, numbers or letters may be used. Identify from the below, which block contains a violation of this pattern.