# Warm-Up 3 Solutions. Peter S. Simon. October 13, 2004

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1 Warm-Up 3 Solutions Peter S. Simon October 13, 2004

2 Problem 1 An automobile insurance company has compiled data from a survey of year-old drivers during the year According to the results shown, what percent of them have had at least two accidents? Express your answer to the nearest tenth. # Accidents # Drivers

3 Problem 1 An automobile insurance company has compiled data from a survey of year-old drivers during the year According to the results shown, what percent of them have had at least two accidents? Express your answer to the nearest tenth. # Accidents # Drivers # drivers with 2 accidents Total # drivers 100% = % = % = 64.2%

4 Problem 2 Connie spent the weekend making cookies. She made 60 sugar cookies, 80 chocolate chip cookies and 100 peanut butter cookies. She plans to make packages of cookies that each contain an identical assortment of whole cookies. How many cookies are in a package, assuming that she makes as many packages as possible and uses all of the cookies she made?

5 Problem 2 Connie spent the weekend making cookies. She made 60 sugar cookies, 80 chocolate chip cookies and 100 peanut butter cookies. She plans to make packages of cookies that each contain an identical assortment of whole cookies. How many cookies are in a package, assuming that she makes as many packages as possible and uses all of the cookies she made? To maximize the number of packages, we minimize the number of cookies per package. The numbers of each kind of cookie in a package must be in the ratio 60 : 80 : 100 = 6:8:10= 3:4:5 so that there are = 12 cookies per package.

6 Problem 3 What is the greatest surface area of a rectangular solid that can be built from 16 identical unit cubes?

7 Problem 3 What is the greatest surface area of a rectangular solid that can be built from 16 identical unit cubes? To maximize the surface area, we choose an arrangement that maximizes the number of exposed faces on each cube. This will happen when the cubes are arranged in a straight line. In this case, all but two of the cubes will have four faces exposed. The two end cubes will have five faces exposed. So the surface are is = 66

8 Problem 4 On a number line, the coordinates of P and Q are 8 and 48, respectively. The midpoint of PQ is B, the midpoint of BQ is C, and the midpoint of PC is D. What is the coordinate of D?

9 Problem 4 On a number line, the coordinates of P and Q are 8 and 48, respectively. The midpoint of PQ is B, the midpoint of BQ is C, and the midpoint of PC is D. What is the coordinate of D? B is midpoint of PQ = B = = C is midpoint of BQ = C = = 38 2 D is midpoint of PC = D = = 23 2

10 Problem 5 When n is an odd integer, there is a value of m for which n = 4m. Ifn = 11, what is the value of m?

11 Problem 5 When n is an odd integer, there is a value of m for which n = 4m. Ifn = 11, what is the value of m? m = n = = = 31

12 Problem 6 What integer is closest to the value of 10π + 99?

13 Problem 6 What integer is closest to the value of 10π + 99? Method 1: Without Calculator 10π , = 10 10π =

14 Problem 6 What integer is closest to the value of 10π + 99? Method 1: Without Calculator 10π , = 10 10π = Method 2: With Calculator 10π

15 Problem 7 What is the mean of the set {73, 78, 81, 90, 85, 97}?

16 Problem 7 What is the mean of the set {73, 78, 81, 90, 85, 97}? Mean = = = 84

17 Problem 8 Christine jogged for half an hour. Amy walked for 50 minutes. Using the information in this chart about exercise and calories burned, how many more calories than Amy did Christine burn? Activity Calories Burned in 5 Min. Walking 28 Jogging 57

18 Problem 8 Christine jogged for half an hour. Amy walked for 50 minutes. Using the information in this chart about exercise and calories burned, how many more calories than Amy did Christine burn? Activity Calories Burned in 5 Min. Walking 28 Jogging cal Christine cals = 30 min = 342 cal 5 min 28 cal Amy cals = 50 min = 280 cal 5 min Christine cals Amy cals = = 62 cal

19 Problem 9 Tyler s age is half Mary s age. In four years, Tyler s age will be two-thirds Mary s age. How old is Tyler now?

20 Problem 9 Tyler s age is half Mary s age. In four years, Tyler s age will be two-thirds Mary s age. How old is Tyler now? Let T and M be the current ages of Tyler and Mary. T = M 2

21 Problem 9 Tyler s age is half Mary s age. In four years, Tyler s age will be two-thirds Mary s age. How old is Tyler now? Let T and M be the current ages of Tyler and Mary. T = M 2, T + 4 = 2 (M + 4) 3

22 Problem 9 Tyler s age is half Mary s age. In four years, Tyler s age will be two-thirds Mary s age. How old is Tyler now? Let T and M be the current ages of Tyler and Mary. T = M 2, T + 4 = 2 (M + 4) 3 Since we want to find Tyler s age, we write the first equation above as M = 2T and substitute this value of M into the second equation: T + 4 = 2 3 (2T + 4) = 3(T + 4) = 2(2T + 4) = 3T + 12 = 4T + 8 = T = 4

23 Problem 10 Quadrilateral ABCD is congruent to quadrilateral WXYZ. We are given that AB = 5 cm, BC = 7 cm, YZ = 6 cm, and ZW = 4 cm. What is the perimeter of quadrilateral ABCD?

24 Problem 10 Quadrilateral ABCD is congruent to quadrilateral WXYZ. We are given that AB = 5 cm, BC = 7 cm, YZ = 6 cm, and ZW = 4 cm. What is the perimeter of quadrilateral ABCD? First, we list the congruent line segments: XY BC, WZ AD, YZ CD, WX AB

25 Problem 10 Quadrilateral ABCD is congruent to quadrilateral WXYZ. We are given that AB = 5 cm, BC = 7 cm, YZ = 6 cm, and ZW = 4 cm. What is the perimeter of quadrilateral ABCD? First, we list the congruent line segments: XY BC, WZ AD, YZ CD, WX AB So now, finding the perimeter of ABCD is easy: Perimeter of ABCD = AB + BC + CD + DA = YZ + ZW = = 22 cm

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