The volume of a cube is 17,576 mm 3. What is the length of each edge of the cube? COURSE 2 LESSON 8-10 A cube is a rectangular prism in which length, width, and height are the same. Given the volume of 17,576 mm 3, you need to find the length, width, and height of the cube. You know the relationship between the length, width, and height of a cube. Use that to test possible dimensions of the cube and see if they produce the desired volume. Organize the test results in a table. Method 1 Try, Check, and Revise 8-10 Try, Check, and Revise and Write an Equation

(continued) COURSE 2 LESSON 8-10 The length of each edge of the cube is 26 mm = 2,744 Too low = 74,088 Too high = 39,304 Too high = 13,824 Too low = 17,576 l w h Volume Conclusion 8-10 Try, Check, and Revise and Write an Equation

(continued) COURSE 2 LESSON 8-10 The length, height, and width of the cube are equal. s = the length of the cube s = the width of the cube s = the height of the cube 8-10 Try, Check, and Revise and Write an Equation Another way to solve this is to use the formula for the volume of a rectangular prism to write an equation. Method 2 Write an Equation

(continued) COURSE 2 LESSON 8-10 The length, width, and height of the cube are each 26 mm, so the length of each edge of the cube is 26 mm. The formula for the volume of a rectangular prism is V = lwh. You know the volume is 17,576 mm 3. l w h = VUse the volume formula. s s s = 17,576Substitute. s 3 = 17,576Simplify. 33 s 3 = 17,576Take the cube root of each side. s = 26Simplify Try, Check, and Revise and Write an Equation

(continued) COURSE 2 LESSON 8-10 To check the answer you can use the definition of a cube. The length, width, and height have to be equal. l = w = h = 26 Also, the volume has to equal 17,576 mm = 17,576 The answer checks Try, Check, and Revise and Write an Equation

Use Try, Check, and Revise or Write an Equation to solve the problem. 1.A triangular sign has an area of 972 cm 2. Its base is 36 cm long. What is the height of the sign? 2.Jan has 19 bills worth a total of $87. How many $1 bills, $5 bills, and $10 bills does she have? COURSE 2 LESSON cm seven $1 bills, eight $5 bills, and four $10 bills 8-10 Try, Check, and Revise and Write an Equation