Any number that doesn't change is a constant. Some famous ones are the gravitational constant, the speed of light in a vacuum, and Planck's constant.
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The specific rate constant a proportionally determined constant that is usually different for various reactions with changes in temperature.
Volume of cyliner=Pi(r2)h so if r is constant, the ony variable is h so what is dv/dh? Pi(r2) which is constant.
Simple interest.
The question doesn't make sense, because any nonzero number raised to the zero (0) power (exponent) will always equal one (1).
let f(x) = ax if a is a constant, then f'(x) = a if a is not constant, then f'(x) = ax' + a'x