Answer:Q12 ) 26635.2 feet^3Q13 ) 6838.9 inches^3Q14 ) 1934.4 feet^3Q15 ) 339120 meters^3Step-by-step explanation:Question 12 -Use the formula for the volume of a cylinder which is:V = πr^2hSubstitute the given values from the problem into the formula:V = 3.14 × 18.8^2 × 24V = 26635.23...V = 26635.2 feet^3 (nearest tenth)Question 13 -Use the formula for the volume of a cylinder which is:V = πr^2hSubstitute the given values from the problem into the formula:Note:Radius = Diameter ÷ 2Therefore, in this problem, divide the diamater (22) by 2 to get the radius (11).V = 3.14 × 11^2 × 18V = 6838.92V = 6838.9 inches^3 (nearest tenth)Question 14 -Use the formula for the volume of a cylinder which is:V = πr^2hSubstitute the given values from the problem into the formula:V = 3.14 × 5.55^2 × 20V = 1934.397V = 1934.4 feet^3 (nearest tenth)Question 15 -Use the formula for the volume of a cylinder which is:V = πr^2hSubstitute the given values from the problem into the formula:V = 3.14 × 60^2 × 30V = 339120 meters^3