Exam: Math Final

Which pair shows equivalent expressions? {Ans: 3(x + 2) = 3x + 6}A customer buys a CD for $15 and a video game. The customer pays a total of $42.80 for the two items, which includes 7% sales tax. Which equation can be used to find x, the cost of the video game before tax? {Ans: 1.07(15 + x) = 42.80}Laura determined the difference between 8 and -2 using the additive inverse. Her steps are shown below. 8 - (-2) = -8 + 2 = -6 Which best describes the error in Laura's work? {Ans: The 8 should have remained positive.}What is the quotient? -4 1 3 -3 4 {Ans: 5 7 9}When Nancy started middle school, she was 60 inches tall. When she started high school, she was 66 inches tall. What was the percent change in her height? {Ans: 10 percent increase}A bookstore bought a case of 10 books at a wholesale price of $84. The bookstore will sell the books at a 25 percent markup, and each book will be sold for the same amount. How much will they sell each book in the case for? {Ans: $10.50}Which expression is equivalent