Answer:
<h2>C</h2>
Step-by-step explanation:
V=0.5*b*l*h
V=0.5*10*28*12
V=10*14*12
V=10*168
V=1680 m^3 or C
36, because the square root of 4 is 2 and the square root of 81 is 9. You multiply those and then double it to get 36.
The correct way 21/6 would be in decimal form is 3.5
radius* 2=diameter so no diameter and radius aren't the same thing because radius is half the distance across the circle and diameter is the full distance across the circle.