Solve<span> A = </span>bh<span> for b. Since </span>h<span> is multiplied times b, you must divide both sides by </span>h<span> in order to isolate b. Since (c+d) is divided by 2, you must first multiply both sides of the equation by 2. Then you have to subtract c from both sides in order to isolate d.</span>
We know that the volume is: V = 1 gallon = 231 in³ Also : r = 3 in. The volume of a cylinder: V = r² π h 231 = 3³ · 3.14 · h 231 = 9 · 3.14 · h 231 = 28.26 h h = 231 : 28.26 h = 8.17 ≈ 8 in Answer: C) 8 in.
