10 minutes
Daguerreotype
Connect the cable between them
Shutters
A digital camera
Chemicals
Joseph Niepce
White
Copper
Camera Lenses
False
True
True
True
False
Thank you for taking photography class, I am doing the same class (FLVS SQUAD!!)
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)
<span>
If Johanna wants to label the x and y axes in an Excel chart, she should click anywhere on the chart, then click on the Layout tab. Under Labels, she should click on Axis Titles, and select the Secondary Horizontal Axis Title for x axis or <span>Secondary Vertical Axis Title for y axis. She should then select the text that is in the Axis Title box, and type the title name that she wants.</span></span>
Answer:
public class ANot {
public static void main(String[] args) {
int numberOfSides = 20;
boolean isQuadrilateral;
if(numberOfSides==4){
isQuadrilateral = true;
System.out.println("The triangle is quadrilateral");
}
else{
isQuadrilateral=false;
System.out.println("The triangle is not quadrilateral");
}
}
}
Explanation:
- Create and Initilize the int variable numberOfSides (You can also receive this from a user using the scanner class for example).
- create a boolean variable isQuadrilateral
- Use if and else statement to check if numberOfSides ==4 and assign true to isQuadrilateral else assign false
Answer:
public class num9 {
public static void main(String[] args) {
int sum =0;
int num =5;
for(num =5; num<=500; num+=5){
System.out.println(num);
sum +=num;
}
System.out.println(sum);
}
}
Explanation:
- Declare and initialize the variables sum and num
- Use a for loop with the condition for(num =5; num<=500; num+=5) Since the loop will increment by 5 and run from 5 to 500
- Within the loop, add num to sum at each iteration
- Print all elements on seperate lines
- Outside the loop, print the final value of sum
Create a for loop
