Leptin is a hormone that has a central role in fat metabolism. One study published in the New England Journal of Medicine measured serum leptin concentrations versus the percentage of body fat for 275 individuals. The concentration of leptin c (in ng/Lm) is approximated by c=219x2 -26.7x+1.64, where x is percentage of body fat. (a) Determine the concentration of leptin in an individual with 6% body fat (x=0.06). Round to 1 decimal place. (b) If an individual has 3 ng/Lm of leptin, determine the percentage of body fat. Round to the nearest whole percent

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