What is the difference? Negative 6 minus (11)

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?