Answer:
9+6i
Step-by-step explanation:
3+6=9
5+1=6
400 divided by 42 = 9.523809
V<span>=(</span><span>4/</span><span>3)</span><span>πr^</span><span>3
R=radius
Diameter= 2 times R
so,
R=7 ft
plugging the values;
V=(4/3)(3.14)(7)^3
V=1436.02 Cubic feet</span>
Circumference of whole circle =

360÷20=18

hence length of arc = 1/3 pi