Solution :
Here, we need to perform JOIN operation of the students and registration.
Use NATURAL JOIN operator 
and so no need to specify Join condition.
Also we need to selection operator tp select only those course whose major in "philosophy".
Finally we projection operator π to project only distinct students name who took at least three courses.
![$\pi [\sigma_{\text{student's nam}e} [ \sigma(\text{three courses}) \Join \text{"Philosophy"}]]$](https://tex.z-dn.net/?f=%24%5Cpi%20%5B%5Csigma_%7B%5Ctext%7Bstudent%27s%20nam%7De%7D%20%5B%20%5Csigma%28%5Ctext%7Bthree%20courses%7D%29%20%5CJoin%20%5Ctext%7B%22Philosophy%22%7D%5D%5D%24)
Answer:
International System of Units
Explanation:
Answer:
4G/5G.
Explanation:
The broadband cellular network technology that mobile platforms utilize to stream voice, IP telephony, mobile internet access, video calling, gaming services, cloud computing, high-definition mobile TV, and mobile 3-D TV is 4G/5G.
4G technology refers to the fourth generation broadband cellular network technology that is typically used for cellular communications on mobile phones and it is considered to have an internet speed that is ten times faster than what is obtainable on the third generation (3G) broadband technology.
Similarly, 5G is the fifth generation broadband cellular network technology that succeeded 4G and it offers higher quality in terms of performance, reliability, availability and efficiency.
As a result of the speed and high quality specifications of the 4G/5G broadband cellular network technology, they are widely used for various communications systems.
Answer:
Each variable is named so it is clear which variable is being used at any time. It is important to use meaningful names for variables: ... The name given to each variable is up to the programmer, but ideally a variable name should have meaning, ie it should reflect the value that it is holding.
Variables make code more than a static set of instructions. They allow logic to occur, enabling developers to measure time, analyze data, and customize the program to the user. Variables are so important to the code that they deserve a good name that accurately describes their purpose
Explanation:
