First, multiple-choice questions.
On the number axis, the number represented by the point from the origin 3 is ().
A.-3,B. 3,C. -2,D. 2 .
Point m is the point on the number axis that represents -2. If the point m is translated 5 units to the right along the number axis to the point n, the number represented by the point n is ().
A.-7,B- 3,C. 3,D. 7 .
If a+b > 0 and ab < 0, then ().
A.a>0,b>0,B. a