In january, a bookstore sells 450 books, but in february, it sells only 300 books. what is the percent of change from january to february?

66.7%
-33.3%
50%
-50%

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

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?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.