2.1 Use Integers and Rational Numbers
True or false: All integers are rational numbers, but not all rational numbers are integers.
True
8 + (-11)
-3
18 - (-7)
25
-9(-10)
90
Classify the numbers as whole numbers, integers, and rational numbers. State all the possibilities for every number:
3, -4.1, -7, 109,000
3: Whole, integer, and rational
-4.1: rational
-7: integer and rational
109,000: whole, integer, and rational
-5.3 + (-4.9)
-10.2
Evaluate the expression when x=7.1 and y=-2.5
-y - (1.9 - x)-1.9
Identify the illustrated property:
0.3(3) = 3(0.3)
Commutative property of multiplication
10.1
If x = 2.4, evaluate -1.7 + (-5.4) + (-x)
-9.5
Find the change in elevation:
36.4 feet above sea level to -90.7 feet below sea level.
-127.1 feet
9(-2/3)(-1/5)
6/5
Put these rational numbers in order from least to greatest:
-4, 5, -17.1, -(-6.2001)
-17.1, -4, 5, -(-6.2001)
Which property of addition is illustrated here?
(x + 9) + 2 = x + (9 + 2)
Associative property of addition
Evaluate when x=3.6, y=-6, and z=-11
(x - y) - lzl
-1.4
-6r(-2.8r)
16.8r²
Define a rational number ACCURATELY
A number that can be written as a/b where a and b are integers and b does not equal zero.
Page 79, #57a
Your friend has the better score at -2. You have -1.
The temperature inside Mammoth Cave in Kentucky is about
12.2 C year round. If the temperature outside the cave is -2.4 C,
what is the change in temperature from outside to inside the cave?
14.6 C
In 1940 the surface area of the Dead Sea was about
980 square kilometers. From 1940 to 2001, the average rate of change in
surface area was about -5.7 square kilometers per year. Find the surface
area of the Dead Sea in 2001.
632.3 km²