Who made "rock around the clock" (used in the tv show happy days) popular in the 1950s?

Amplitude is: a. the number of waves in a certain amount of time. b. the distance between the top or bottom of a wave and the center of the wave. c. the noise floor acceptable in recording. d. the distance between two identical points on a wave.

Ablind girl lost her pencil, book and what did she lose first? (this is really good for people who don't have an adequate amount of points! )

Name the painting above and its artist. what media was used to create this piece? why do you think the artist chose to use this media for this piece?