You drive on Interstate 10 from San Antonio to Houston, half the time at 64 km/h and the other half at 85 km/h. On the way back you travel half the distance at 64 km/h and the other half at 85 km/h. (a) What is your average speed from San Antonio to Houston

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

c. magnitude and direction