Functions of several variables 475 9.1 44. cholesterol researchers have developed a mathematical re- lationship between the concentrations of low-density lipopro- tein cholesterol (ldl-c), high-density lipoprotein cholesterol (hdl-c), triglyceride (tg), and fasting total cholesterol (tc) as follows: ldl-c tc (hdl-c + 0.16tg) where each measurement is in milligrams per liter (mg/). source: jama. a. express this mathematical relationship using the func- tional notation, l(f. h.t). where l is the low-density concentration, f is the total fasting concentration, h is the high-density concentration, and t is the triglyceride con- centration. b. find l(2000, 1300, 2500). ad 45. total body water accurate prediction of total body water in is critical in determining adequate dialysis doses for patients d- with renal disease. for white males, total body water can be nd. estimated by the function τa, w. b) 23.04-0.03a +0.50w-0.62b cle where t is the total body water (in liters), a is age (in yr), w is weight (in kg), and b is the body mass index. source: kidney international. find t(55, 75, 30). m, ha