One foot<span> equals </span>12 inches<span>, meaning that </span>1 inch<span>equals 0.083 </span>feet<span>. </span>One<span> yard equals 3 </span>feet<span> or 36</span>inches<span>, and </span>one<span> mile equals 5,280 </span>feet<span>.</span>
The original volume of the ballon, with radius r, is given by
V₀ = (4/3)πr³ in²
If the radius increases to (r+5) because of air input, the new volume is
V₁ = (4/3)π (r+5)³ in²
The difference in volume is the amount of air used to inflate the balloon.
The volume of air is
V = V₁ - V₀
= (4/3)π [r³ + 3r²(5) + 3r(5²) + 5³ - r³]
= (4/3)π (15r² + 75r + 125) in³
Answer: (4/3)π (15r² + 75r + 125) in³
Answer:
a
Step-by-step explanation: