84 CHAPTER 1 The Real Number System
20.For a certain system of rating relief pitchers,
3 points are awarded for a save, 3 points are
awarded for a win, 2 points are subtracted
for a loss, and 2 points are subtracted for a
blown save. If Brad Lidge of the Philadel-
phia Phillies has 4 saves, 3 wins, 2 losses,
and 1 blown save, how many points does
he have?21.For 2009, the U.S. federal government collected $2.10 trillion in revenues, but spent
$3.52 trillion. Write the federal budget deficit as a signed number. (Source: The Gazette.)Match each property in Column I with the example of it in Column II.
III
22.Commutative property A.
23.Associative property B.
24.Inverse property C.
25.Identity property D.
26.Distributive property
E.27.What property is used to clear parentheses and write
28.Consider the expression
(a)Evaluate it by first working within the brackets.
(b)Evaluate it by using the distributive property.
(c) Why must the answers in parts (a) and (b) be the same?Simplify by combining like terms.- 8 x+ 4 x- 6 x+x+ 14 x 30. 512 x- 12 - 1 x- 122 + 213 x- 52
- 635 + 1 - 224.
31 x+ 12 as 3x+3?-
5
3
a-3
5
b= 1- 5 + 13 + 22 = 1 - 5 + 32 + 2
- 31 x+y 2 =- 3 x+ 1 - 3 y 2
15 + 22 + 8 = 8 + 15 + 22
3 x+ 0 = 3 xhttp://www.ebook777.com
http://www.ebook777.com