How do you know if two line segments are parallel?
a. their slopes have reciprocals
b. the slope of one is the negative of the slope of the other
c. their slopes are negative reciprocals
d. their slopes are equal

The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. the front two wheels are six feet apart. what is the number of feet in the path traced by the inside front wheel in one trip around the circle? express your answer in the form "k \pi", where k is an integer.

Write two subtraction equations that are equivalent to 5 + 12 = 17.

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry