# Chapter 4 - An Introduction to Functions - 4-5 Writing a Function Rule - Practice and Problem-Solving Exercises - Page 267: 35

a) The recommended dosage for a person whose mass is 60 kg is 660 mg. b) The recommended dosage for a 200-lb person is 1260 mg.

#### Work Step by Step

D= $0.1m^2$+5m A) Substitute the given mass of 60 kg for m in the equation. m=60 $D= 0.1(60)^2+5(60)$ D= 660 mg Therefore, the recommended dosage for a person whose mass is 60 kg is 660 mg. B) mass = 200-lb 1. convert pounds to kilograms. 1 lb=0.45 kg =0.45(200) kg = 90 kg 2. Substitute the mass of 90 kg for m in the equation. m=90 $D= 0.1(90)^2+5(90)$ D= 1260 mg Therefore, the recommended dosage for a 200-lb person is 1260 mg.

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