College of Marin Study Guide for Math 95 A,B - Pearson Learning ...

51 Study Guide for Math 95A, B[7.1] 15. To get a B, a student must have an average of 80. The previous scoreswere 80, 74, 81, and 75. What is the lowest score that the student can get on the lasttest and still get a B?Let x the score on the last test.80 74 81 75 x--------------------------------------------------------- 80; 310 x 5 • 80; x 400 310 905See the graph on page 397 of your textbook for problems 16–18. Suppose the familyhas a monthly income of $2000.[7.4] 16. Which item accounts for the greatest expense?The item that accounts for the greatest expense is food at 28%.[7.4] 17. How much is spent for transportation?Let x the amount spent for transportation is 10% of monthly income.x 10% of $2000 0.10 • 2000 $200 is spent for transportation.[7.4] 18. What percent would be spent on medical and personal care combined?Since 12% if spent on medical care and 2% on personal care, 12% 2% 14% would be spent on medical care and personal care combined.[7.1] 19. (See problem 2 on p. 405.) Find the average of the ratings for A (7.75) andthe average for B (7.687). The students preferred problem A.[8.1] 20. How many inches are there in 7 yards?7 yards-----------------13 feet 12 inches• -------------- • ---------------------- 252 inches1 yard 1 foot[8.2] 21. Complete the following: 98 cm __________________ m98 cm--------------1[8.2] 22. Complete the following: 7.44 m __________________ hm7.44 m----------------11 m• ----------------- 0.98 m100 cm1 hm• -------------- 0.0744 hm100 m[8.3] 23. Find the perimeter of the rectangle that is 5 ft by 10 ft.Let P the perimeter in ft.P 2L 2W; P 2 • 10 2 • 5 30 feet[9.1] 24. Find the area of the square that is 22 feet on a side.Let A the area in sq ft.A s • s 22 • 22 484 square feet[9.1] 25. How much would it cost to carpet a 15 ft by 20 ft room, if the carpet costs$18.50 per square foot?Let A the area in sq ft.A L • W 15 • 20 300 square feetC the cost in $.C $18.50---------------- • 300 sq ft $5550sq ft