video1.0<iframe src="https://www.loom.com/embed/572259dfe5e44f8f978dc3717bbaa040" frameborder="0" width="962" height="721" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>721962Loomhttps://www.loom.com721962https://cdn.loom.com/sessions/thumbnails/572259dfe5e44f8f978dc3717bbaa040-00001.jpg164p: If x is the average (arithmetic mean) of m and 9, y is the average of 2m and 15, and z is the average of 3m and 18, what is the average of x, y, and z in terms of m ? a: m + 6 ; m + 7 ; 2m + 14 ; 3m + 21 ;