Aruler is 30 cm in length. a piece, x cm in length, breaks off. write an expression for the length that is left.

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Solve the triangle. a = 21°, c = 105°, c = 5

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)