Jack is learning to play the piano which has 88 keys if there are 12 unique keys in each octave. how amny complete octaves are on the piano

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )

What is the circumference of a circle with an area of 50.24 cm²?

Atriangle has side lengths of x, x+11, and 3x+5. what is the perimeter?