Page 40 - Algebra 1

Lesson Practice
Simplify.
(Ex 1)
a. ⎪-3.4⎥
c. ⎪14 + (-22)⎥
Find the sum.
(Ex 2)
e. (-23.4) + 18.72
Determine whether each statement is true or false. Give a counterexample for
false statements.
(Ex 3)
g. The set of rational numbers is closed under addition. h. The set of positive integers is closed under addition.
i. The temperature at 7:00 p.m. was 34°F. The temperature fell 12°F by (Ex 4) midnight. Use addition to find the temperature at midnight.
_6 b. ⎪7⎥
d. -⎪7 + 16⎥
f. (-_2 )+ (-_1 ) 36
Practice
Distributed and Integrated
Add, subtract, multiply, or divide.
1.
(SB 3)
4.
(SB 3)
7.
(2)
8.
(SB 12)
9.
(SB 4)
10.
(1)
11.
(1)
12.
(1)
13.
(SB 5)
14.
(SB 1)
15.
(SB 5)
16.
(5)
1_1 +3_1 6 3
3_1 ÷1_3 3 5
2. 2_3 -1_1 (SB 3) 8 4
5. 1.506÷0.2 (SB 2)
3. 3_2 +1_5 -1_3 (SB 3) 3 8 4
6. 2.89·1.2 (SB 2)
How many terms are in the algebraic expression 2x2 + 3x + 7? Find the prime factorization of 150.
Write Use the divisibility test to determine if 125,000 is divisible by 10. Explain your answer.
Model Represent the following numbers as being members of set L: -12, 0, -8, 4, -4, 4, 0, 8, 8, 12.
Verify True or False: All integers are rational numbers. Explain your answer.
3 4
Write _5 as a decimal and a percent. 8
Measurement Order the lengths 1.25 yards, 3 feet, 1_1 yards from least to greatest. 3
Write 7% as a fraction in simplest form and as a decimal.
Formulate Write an equation using absolute values to represent the sentence.
“The distance from -11 to 0 is 11.”
_
Error Analysis Student A said that √ 2 is a rational number. Student B said that it is
1
an irrational number. Which student is correct? Explain your answer.
Lesson 5 25