QRB 501 Final Exam Answers QRB 501 Final Exam 1) Write the following as an algebraic expression using x as the variable: Triple a number subtracted from the number A. 3(x - x) B. x 3 – x C. 3x - x D. x - 3x 2) Write the following as an algebraic expression using x as the variable: A number decreased by 25 and multiplied by 4 A. x – 25 · 4 B. -25x · 4 C. 4x - 25 D. 4(x – 25) 3. Write the following as an algebraic expression using x as the variable: The sum of a number and -8 A. -8 + x B. -8 - x C. x (-8) D. -8x 4) Write the following as an algebraic expression using x as the variable: Twelve less than six times a number A. 12 – 6x B. –6x C. –12(6x) D. 6x – 12 5) Solve: -3 – (-2 + 4) - 5 A. 15 B. 10 C. -6 D. -10 6) Solve: (–5)2 · (9 – 17)2 ÷ (–10)2 A. 16 B. 64 C. -6.4 D. -.039 7) Solve: 3(32) – 8(9 – 2) ÷ 2 A. -14.5 B. 55 C. 66.5 D. -1 8) Solve: (–5)2 · (9 – 17)2 ÷ (–10)2 A. 16 B. 64 C. -6.4