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:To check spelling in a Word document, open up the document, head to the “Review” tab, then click on “Spelling & Grammar” (part of the “Proofing” group of tools). Then a window will appear showing the first word the program believes to be misspelled. Click through the options to review the whole document.
Explanation:Hope this helped u out btw can i plz have brainlist only if u wanna give me brainlist though have an great day kind sir or ma'am!
Answer:
Ok
Explanation:
I will check him out, do you need anything else though?
Answer:
Adderall is a stimulant and alcohol is a depressant. This does not mean that the two substances cancel each other out. Instead, they compete with each other in your body. This effect can cause serious problems.
Answer:
An input device is something you connect to a computer that sends information into the computer. An output device is something you connect to a computer that has information sent to it.
Explanation:
