Basic Mathematics for College Students

96. GARDENING The illustration shows the depths at
    which the bottoms of various types of flower bulbs
    should be planted. (The symbol represents inches.)
    a. At what depth should a tulip bulb be planted?

b. How much deeper are hyacinth bulbs planted

than gladiolus bulbs?

c. Which bulb must be planted the deepest? How

deep?

WRITING

97. Explain the concept of the opposite of a number.


98. What real-life situation do you think gave rise to the
    concept of a negative number?


99. Explain why the absolute value of a number is never
    negative.


100. Give an example of the use of the number line that
     you have seen in another course.

Ground level

Anemone

Ranunculus

Narcissus

Daffodil

Hyacinth

Tulip

Gladiolus

Freesia

Sparaxis

–1"

–2"

–3"

–4"

–5"

–6"

–7"

–8"

–9"

–10"

–11" PlantingChart

101. DIVING Divers use the terms positive buoyancy,
     neutral buoyancy,and negative buoyancyas shown.
     What do you think each of these terms means?


102. GEOGRAPHY Much of the Netherlands is low-
     lying, with half of the country below sea level.
     Explain why it is not under water.


103. Suppose integer is greater than integer. Is
     the opposite of integer greater than integer?
     Explain why or why not. Use an example.


104. Explain why is less than.

REVIEW

105. Round 23,456 to the nearest hundred.


106. Evaluate:


107. Subtract 2,081 from 2,842.


108. Divide 346 by 15.


109. Give the name of the property shown below:


110. Write four times fiveusing three different symbols.

(132) 5  13 (25)

19  2  3

 11  10

A B

A B

Positive

buoyancy

Neutral

buoyancy

Negative

buoyancy

144 Chapter 2 The Integers

SECTION 2.2

Adding Integers

An amazing change in temperature

occurred in 1943 in Spearfish, South

Dakota. On January 22, at 7:30 A.M.,

the temperature was degrees

Fahrenheit. Strong warming winds

suddenly kicked up and, in just 2 minutes,

the temperature rose 49 degrees! To

calculate the temperature at 7:32 A.M., we

need to add 49 to.

 4  49

 4

 4

Objectives

1 Add two integers that have the

same sign.

2 Add two integers that have

different signs.

3 Perform several additions to

evaluate expressions.

4 Identify opposites (additive

inverses) when adding integers.

5 Solve application problems by

adding integers.

? 7:32 A.M.

Spearfish

SOUTH DAKOTA

7:30 A.M.

49°

increase