Acone has a base radius of 7 centimeters and a height of 21 centimeters. what is the volume of the cone? a. 28π cm3 b. 343π cm3 c. 49π cm3 d. 147π cm3

Π*r^2*h/3so let's plug in the values
π*7^2*21/3
7^2=49
21/3=7
49*7=343
now add the pi to it's side 
343π
so B is your answer.

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post