Rick is 27 years old. Pretend D is David and R is Rick
D+R=81
D=2R
2R+R=81 ---> 3R=81 ---> 81/3=R R=27 3(27)=81 TRY IT!
The answer is D, 32pi
The radius is half the diameter, which is 32. The circumference equation is
or 
So that gives you 32pi
A=2πrh+2πr2=2·π·6·25+2·π·6^2 so the answer is D
The answer to 22 is C) One person caught fewer that 3 fish.
2x+12 would be the answer