Question 473905
1.) 680 centimeters=_______________feet (give answer in decimal form to nearest 1/100)
1 inch = 2.54 cm exactly
1 ft = 30.48 cm
680 cm = 680/30.48 ft
= 22.31 feet
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2.)13 liters is approximately_____________________gallons (give answer in decimal form to nearest tenth)
I don't know, look up the conversion.  Converting is not tutoring.
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3.) 273g=__________________mg 
1 gm = 1000 milligrams
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4.) Find the area of a circle with a radius of 39 cm (use 3.14tt)
{{{Area = pi*r^2}}}
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5.) Find the volume of a sphere with a 15 in. radius
{{{V = 4*pi*r^3/3}}}