Book Maths Puzzle Trigonometry

A room is 16ft long, 14ft wide and 8ft high. How many cubic feet of air does the room contain?

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Book Other Question

a rectangle house lot has an area of 1050 square meters. Its length exceeds its width by 5 meters. What is the dimension of the lot? solve as quadratic equation. Three times the larger of two numbers is equal to four times the smaller.the sum of the numbers is 21. please help me find the numbers.