Page 189 - Basic College Mathematics with Early Integers

166 C HAPTE R 2 I INTEGERS AND INTRODUCTION TO VARIABLES

19. 4 8 2 -3(-2) + 12
19. -6 + (-15) , (-3) 20. - 21.
2 16 -1(-4 - 5)
20.

2
ƒ 25 - 30 ƒ
22. 23. 5(-8) - [6 - (2 - 4)] + (12 - 16) 2
21. 2(-6) + 7

22. 3 2
24. -2 - 2

23.
Evaluate each expression for x = 0, y =-3, and z = 2.
3z
24. 25. 3x + y 26. ƒ y ƒ + ƒ x ƒ + ƒ z ƒ 27.
2y

25.
28. 2y 3 29. 10 - y 2 30. 7x + 3y - 4z

26.
31. Mary Dunstan, a diver, starts at sea 32. Aaron Hawn has $129 in his checking
level and then makes 4 successive account. He writes a check for $79,
27.
descents of 22 feet.After the descents, withdraws $40 from an ATM, and then
what is her elevation? deposits $35. Represent the new
balance in his account by an integer.
28.

29. 33. Mt.Washington in New Hampshire 34. Lake Baykal in Siberian Russia is
has an elevation of 6288 feet above the deepest lake in the world, with
sea level.The Romanche Gap in the a maximum depth of 5315 feet.The
30. Atlantic Ocean has an elevation of elevation of the lake’s surface is
25,354 feet below sea level. Represent 1495 feet above sea level.What is the
the difference in elevation between elevation (with respect to sea level)
31. these two points by an integer. of the deepest point in the lake?
(Source: National Geographic Society (Source: U.S. Geological Survey)
and Defense Mapping Agency)
1495 feet above sea level
32.
1495 feet
Sea level
33. 5315 feet

34. ? elevation

35.
Copyright 2012 Pearson Education, Inc.
35. Find the average of -12, -13, 0, 9. 36. Translate the following phrases into
36. a. mathematical expressions. Use x to
represent “a number.”
a. The product of a number and 17
b.
b. Twice a number subtracted from 20