Although I scanned the other version that's not Early Transcendentals, in Calculus Early Transcendentals 7th ed 2011, James Stewart never defines "constant". It first appears on p. 3 but not in this context, and contextually it first appears on p. 27 when he defines "coefficients of a polynomial".
Why not just call "constants" numbers? Isn't "constant" superfluous? Aren't numbers constant?
Kindly see green underline. Why not call $a$ a positive number, instead of "positive constant"?
