maybe try to right click your answer and maybe itll give you an option to repost ill try some things out on this answer
Answer:
Line 1
Explanation:
Line one is not complete. It should have been #include <iostream> This line tells the compiler to use the input and output header file for this program, the iostream header file contains the functions necessary for output statements used in 7 and 8
There are three dimensions of an object-- the top, the front, and the side views. A Multiview sketch shows two or three views of an object. Multiview sketch gives the shape description of the object. It also serves as the main form of communication between manufacturers and sketchers.
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)
