What's a unknown point thats y-coordinate is zero.

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

What is the cube root of -1,000p^12q3? -10p^4 -10p^4q 10p^4 10p^4q

Point a is at 12, and point d is at 56. point c is midway between a and d, and point b is midway between a and c. which of these is the coordinate of b?