Given JL=4x, JL=4x, JK=2x+3,JK=2x+3, and KL=x, KL=x, determine the numerical length of \overline{KL}. KL
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  KL = 3

Step-by-step explanation:

It appears we are to assume that K lies between J and L, so we have ...

  JK +KL = JL

  (2x+3) +(x) = (4x)

  3x +3 = 4x

  3 = x . . . . . . . subtract 3x

KL = 3

1 number

if we use a graphing calculator, there is only one such number that satisfies the conclusion of the mean value theorem, that is, a number such that

where the right-hand side is the average rate of change of f on the interval [0.5,0.75], which is the slope of the secant line.

in the attached graph, the black line is the secant line which has its slope as the average rate of change of f on [0.5,0.75], while the orange line is the only tangent line to the graph of f in the interval that satisfies the mvt conclusion.