He is correct because the numbers are in opposite directions on the number line, and their distances from 0 on the vertical number line are equal.
Answer:
D
Step-by-step explanation:
9-3z+4+6z-2
13-2+3z
11+3z
9.42 or 3pi
equation of a circle is 2*pi*r
2r is d which is 3 so the answer would be 3pi which equals about 9.42