What is the common difference for this arithmetic sequence?
45, 39, 33, 27, 21, ...

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels

Of the 27 players trying out for the school basketball team, 8 are more than 6 feet tall and 7 have good aim. what is the probability that the coach would randomly pick a player over 6 feet tall or a player with a good aim? assume that no players over 6 feet tall have good aim. a. b. c. d.

11 12 triangle abc is congruent to triangle fde, and both triangles have the same orientation, as shown. what is the slope of df, which is also the slope of ac?