1,To concatenate s1, s2, s3, and s4, you write ________.

A,s1.concate(s2).concate(s3).

B,concate(s4); s1.concate(s2) + s3.concate(s4);

C,((s1.concate(s2)).concate(s3)).concate(s4);

D,s1.concate(s2).(concate(s3).concate(s4));

2,Which of the following statements are correct to concatenate string s1 into s2?

A,		s1 += s2;
B,		s2 += s1;
C,		s2.concate(s1);
		D, s1.concate(s2);

QUESTION 29

Math.cos(Math.PI) returns ________.

		0.0
		1.0
		-1.0
		0.5