Chapter 5: Exercises with Solutions

Chapter 5Quadratic Functions9. We are trying to solve for d, so d = vt is the formula we want to use. But noticethat the rate v is given in m/min, while time t is given as 600 seconds. We must firstmake the units match, so convertNow plug into the formula.t = 600 s= 600 s × 1 min60 s= 10 mind = vt= 80= 800 mm× 10 minmin11. We are trying to solve for t, so divide d = vt by v on each side first to get t = d/v.But notice that v is given in cm/s, while distance d is given in meters. We must firstmake the units match.Now plug in to the formulad = 20 m= 20 m ×= 2000 cm100 cm1 mt = d v2000 cm=200 cm/s= 2000 cm × 1 s200 cm= 10 sVersion: Fall 2007