Which function is not continuous? a. your altitude as a function of time while flying from reno to dallas. c. number of tennis balls that can fit completely inside a particular box as a function of the radius of the tennis balls. b. time of travel from miami to pensacola as a function of driving speed. d. area of a circle as a function of radius.

C is not continuous. 

Continuous functions have connected graphs; this indicates that every possible value of x has a value of y associated with it.  In this case, that says that every possible radius measurement has a number of tennis balls associated with it.  The problem with this is that we cannot have a fractional part of a tennis ball, so it is not continuous.

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for