Given a plane, how many unique pairs of parallel lines can be drawn on the plane?

What is the formula for standard deviation.

One angle of a triangle measures 140°. The other two angles are in a ratio of 3:5. What are the measures of those two angles?

Simple interest is best defined as

Which line shows the first error?4x+8=2x-10

Ason paid less than $14 for a pack of tennis balls. Each tennis ball cost $2.25. The tennis balls were available in packs of 4, 6, 8, and 10. Use the inequality to find the maximum number of tennis balls, t, in the pack.

When are fractions useful? When are ratios useful?

What are some characteristics of a good math explanation

Kahlil is recording a beat for a song that he is working on he wants the length of the beat to be more than 17 seconds long. His friend tells him the beat needs to be 9 seconds longer than that to match the lyrics he has written.

If the parent function f (x) = (2x - 3) 3 is transformed to g (x) = (-2x + 3) 3, which type of transformation occurs?

What is absolute value of - 3 - 6