A is generally small (usually in the range 0.001 to 0.003), and has the effect of increasing the force of mortality substantially at younger ages (when x is small and thus when the term BCx is relatively insignificant. At older ages, this term swamps the value of A entirely, meaning that at older ages the Makeham curve and Gompertz curve are virtually indistinguishable. Applying the same algebraic logic to the Makeham curve allows us to derive an expression for n px in terms of the constants A, B and C and age (x)