Page 288 - Algebra 1

Identify the values that make the rational expressions below undefined.
*5.
(43)
7.
(42)
9.
(23)
10.
(24)
11.
(25)
25 *6. 12+3x __
x + 10
What is 14% of 120?
(43) 5 - x
8. What is 75% of 60?
(42)
A school needs to raise $2700. A nearby store promises to donate twice the amount the students raise. How much money do the students need to raise?
Ann-Marie has $2.55 in nickels and dimes. She has $1.80 in dimes. How many nickels does Ann-Marie have?
a. Write an equation to represent the situation.
b. How many nickels does she have?
Error Analysis Two students use the diagram to determine whether the 3
relation is a function. Which student is correct? Explain the error. 4 6
10
3
6 12
Student B
{(3, 3), (4, 6), (6, 6), (10, 12)} All the x-values are different, so it is a function.
Student A
{(3, 3), (4, 6), (6, 6), (10, 12)} The y-values are not all different; y equals 6 twice. So, it is not a function.
12.
(30)
13.
(31)
*14.
(43)
*15.
(43)
*16.
(43)
17.
(33)
18.
(34)
Write Explain how you can use a graph to tell whether a relation is a function. Geography A map shows a 2.5-inch distance between Brownsville and Evanstown.
The scale on the map is 1 inch:25 miles. How far apart are the two towns? Multiple Choice Which of the following rational expressions is undefined at x = -6?
x-6 x __
A 12x+72 B 2(x+12) C x+6 D2x+12
__
x
a digital signal. What is the simplified form of this signal representation? Analyze Given the rational expression _8x , for what values of x would its
reciprocal be undefined?
72 - 12x
Digital Signal Processing
In digital signal processing, electronic signals are often
_2_ represented as rational expressions. The rational expression 3z + 2.7z models (z + 0.9)(z - 0.9)
2x + 16
Phone Numbers A student forgets the last two digits of her friend’s phone number. She does remember that the digits are different. What is the probability of guessing the last two digits correctly on the first try?
Multi-Step In an arithmetic sequence, a1 = 17 and d = 10. a. Write a rule for the nth term of the sequence.
b. Use the rule to find the fourth and eleventh terms of the sequence.
Lesson 43 273