Page 137 - Basic College Mathematics with Early Integers

114 C HAPTE R 2 I INTEGERS AND INTRODUCTION TO VARIABLES

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31. 2y - 4y + 3 32. 3z - z + 10 33. (3y - 2x) 2 34. (4y + 3z) 2

35. (xy + 1) 2 36. (xz - 5) 4 37. 2y(4z - x) 38. 3x(y + z)

7x + 2y 6z + 2y
39. xy(5 + z - x) 40. xz(2y + x - z) 41. 42.
3x 4

5(F - 32)
43. The expression 16t 2 gives the distance in feet that an 44. The expression gives the equivalent
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object falls after t seconds. Complete the table by degrees Celsius for F degrees Fahrenheit. Complete
evaluating 16t 2 for each given value of t. the table by evaluating this expression for each given
value of F.
t 1 2 3 4
F 50 59 68 77
16t 2
5(F - 32)
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Objective Write each phrase as a variable expression. Use x to represent “a number.” See Example 6.

45. The sum of a number and five 46. Ten plus a number

47. The total of a number and eight 48. The difference of a number and five hundred

49. Twenty decreased by a number 50. A number less thirty

51. The product of 512 and a number 52. A number times twenty

53. A number divided by 2 54. The quotient of seven and a number

55. The sum of seventeen and a number added to the 56. The difference of twice a number, and four
product of five and the number

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57. The product of five and a number 58. The quotient of twenty and a number, decreased
by three

59. A number subtracted from 11 60. Twelve subtracted from a number