data structure, java

Consider the following method: public static int calculate(int x) { x = x + x; x - x + x x= x + x; return x; > Which of the following can be used to exactly replace the body of calculate? return 3* x; return x**3; return 6*x; return 8 * x; How many asterisks are printed when the following program is executed? public class MyStars public static final int J_MAX - 2: public static int careful(int x) { int y - 1 + x / 2; return y; > public static void loopStars(int n) { int Max = careful(n): for (int i = 1; i > public static void main(String[] args) { loopStara (3); } None 3 4 2 8 Consider the following incorrect Java program. What is output to the console when the program is executed? public class Height { public static void main(String[] args) { double centimeters - 190.0: double feet - 0.0: convert centimeters feet); System.out.printin Height in feet is feet) 7/ converts centimeters to feet publie static void convert(double c, double f) { - (0.39) / 12; Height in feet is: feet Height in feet is: 0.0 Height in feet is: 190.0 Height in feet is: 6.175 Consider the following incorrect Java program: publie elass Height publie static void main(String[] args) { double centimeters - 190.0; double feet = 0.0; convert(centimeters, feet): System.out.println("Height in feet is " + feet); > // converts centimeter to feet public statie void convert(double c, double f) { f - (e. 0.39) / 12; > > What error does this program contain? Java does not allow combined declaration and assignment of double variables The comment appearing before the convert method is not a valid Java comment The main method should be the last method listed in the Java file The convert method assigns the result of its computation to a formal parameter instead of using a return statement