Devide 29 by 2.10 and you get 13.8095238 then round off to 13 So there are 13 dimes and 16 nickels To check the answer just put 13 x 10 +16 x 5 in a calculator and the answer should be 210
X represents nickels y represents dimes x+y=29 5x+10y=210 multiply the first equation by -5 (elimination method) -5x-5y=-145 then add the two equations together 5y=65 divide 5 from both sides y=13 13 dimes
The Formula's for a cylinder is V=r^2h and the volume of a Cone is V=1/3r^2h. So you would know that the volume of a cone is 1/3 the volume of a cylinder.
r^2h and the volume of a Cone is V=1/3