<span>93 * 10^9 = 9.3 * 10^10
</span>
Answer:
I would rename the trapezoid. I would rename it a semi-hexagon, because it is basically half of a hexagon.
Your answer is: 128 pi.
pi x 4^2 x 8
pi x r ^2 x h
(v+4)t=66
t=66/(v+4)
...
(v-4)t=42, using t found above in this equation gives you:
66(v-4)/(v+4)=42 perform indicated multiplication on the left side
(66v-264)/(v+4)=42 multiply both sides by (v+4)
66v-264=42v+168 add 264 to both sides
66v=42v+432 subtract 42v from both sides
24v=432 divide both sides by 24
v=18
So his normal bicycling speed with no wind is 18 mph.
I’m going to say b.66 because 3.14•10.5•2=65.94
I got 10.5 by dividing 21 by 2 because I guessed it was the diameter