The volume of the candle initially is: V=Ab*h Area of the base of the cylinder: Ab=pi*r^2 pi=3.14 Radius of the base: r=4 cm Height of the cylinder: h=6 cm
The candle melts at a constant rate of: r=(60 cm^3)/(2 hours)=(120 cm^3)/(4 hours)=(180 cm^3)/(6 hours) r=30 cm^3/hour
The amount of candle melted off after 7 hours is: A=(30 cm^3/hour)*(7 hours) A=210 cm^3
The percent of candle that is melted off after 7 hours is: P=(A/V)*100% P=[(210 cm^3)/(301.44 cm^3)]*100% P=(0.696656051)*100% P=69.66560510% Rounded to the nearest percent P=70%
