The anser is C for reasons of science ;)
The intersection of two planes is a line. That's not necessarily the definition of a line, but that's probably what they're looking for.
Answer: line
Zero on number lines is neither negative nor positive, it is used as a sort of divider number;)
Step-by-step explanation: this picture should help explain a little
6 + 8x, where x is a number. You can also write this in standard form as 8x + 6.
Answer:

Step-by-step explanation:
To factor the equation, break it into two binomials which multiply to make the equation. To write these binomials (x+a)(x+b), find factors which multiply to -20 and add to -1 for a and b.
20: 1, 2, 4, 5, 10, 20
-5+4 = -1
