1. Homework Answers Standardized Test Prep & Mixed Review P. 143 #s 57-62 all 57) 14.4 cm61) 0.6 58) 18 cans62) 175% 59) C = 1.75 +2.4(m – 1/8); 2 5/8 60) 1250%

2. 2-10 Change Expressed as a Percent Objective: To find percent change. To find the relative error in linear and nonlinear measurement.

3. Warm-Up Two stores advertise sales on their Web site, as shown below. Before the sale, each sweater cost $35. Which store offers the better deal? How do you know?

4. Percent Change Expresses an amount of change as a percent of an original amount. Percent Increase: If new amount is greater than original amount Percent Decrease: If new amount is less than original amount.

5. A coat is on sale. The original price of the coat is $82. the sale price is $74.50. What is the discount expressed as a percent?

6. The average monthly precipitation for Chicago, Illinois, peaks in June at 4.1 in. The average monthly precipitation in December is 2.8 in. What is the percent decrease from June to December?

7. A store buys an electric guitar for $295. The store then marks up the price of the guitar to $340. What is the markup expressed as a percent change?

8. In one year, the toll for passenger cars to use a tunnel rose from $3 to $3.50 What was the percent increase?

9. Relative Error The ratio that represent how off a measurement is from its true value It makes more sense to express this value as a percent. Then it’s called a percent error.

10. A decorator estimates that a rectangular rug is 5 ft. by 8 ft. the rug is actually 4 ft. by 8 ft. What is the percent error in the estimated area?

11. You think that the distance between your house and a friend’s house is 5.5 mi. The actual distance is 4.75 mi. What is the percent error in your estimation?

12. Classwork 2-10 P. 148 #s 7-19 odd

13. Homework 2-10 P. 148 #s 8-18 even

14. Classwork Answers 2-10 P. 148 #s 7-19 odd 7) increase; 50%15) increase; 27% 9) decrease; 7%17) about 55% 11) decrease; 4%19) about 13% 13)increase; 54%

15. Homework Answers 2-10 P. 148 #s 8-18 even 8) decrease; 33%16) about 9% 10) increase; 27%18) about 23% 12) decrease; 2% 14) increase; 10%