Final answer:
The constant 2.69 in the formula should have the same unit as the result for v. Without knowing the units for v, we cannot determine the units of 2.69 from the given information.
Step-by-step explanation:
The value 2.69 in the formula v = 4.1h - 0.018a - 2.69 should have the same unit as the result for v, since it is a constant that is subtracted directly from other terms to compute v. We can infer that if h (height) is measured in meters and a (age) is in years, then the units for 2.69 would logically be the same units as those for v, leaving us with the units of the calculated value of v. As the units of v are not specified in the problem, the units for 2.69 cannot be determined from the given information alone; thus, none of the provided options (Liters, Meters, Years, Centimeters) can be definitely identified as the correct unit for 2.69 without further context.