how do you do this?

Problem 12. The behaviour of Southern Watermelon ants is influenced by several physiological parameters: Orientability h,RS-stability b, and Johnson-Lin index w, all measured in kelagrumz. These can be accurately measured via the VCR test and then used to determine important characteristics such as Individual Merif Mi. Societal Merit Ms, and Toral Merit M1, all historically measured in watermelon seeds (WS). Seminal research by renowned Canadian myrmecologist Megan SaxeCoburg determined that: - Lifespan of Southern Watermelon worker ants is 5 years. - The rate of change of the RS-stability of a worker ant is inversely proportional to its remaining lifespan, with the constant of proportionality of 3 kelagrumz, if the age of an ant is measured in years. - Johnson-Lin index w is equal to the so-called myrmecology-comvolution given by the sum of Orientability and RS-stability. - Societal Merit is proportional to Orientability with the constant of proportionality WS/kelagrumz. - Total Merit is proportional to the Johnson-Lin index with the constant of proportionality 7 WS/kelagrumz. - Individual Merit is genetically determined in the egg and is typically equal to 47 WS. - Total Merit is the sum of Individual Merit and Societal Merit. Determine the rate at which the Johnson-Lin index is changing when the worker ant is 2 years old