Chapter 1
page 8
#18
x+150+77+48=360
x=85 degrees
page 71
#16
w>-80
page 108
#6
function; every input has exactly one output
page 125
#17
x = -2
page 109
#20
The given list is the domain of the function. The range is 6, 7, 8, 9.
page 16
#10
d=-16
page 77
#20
f>1/2
page 109
#22
dependent variable: battery power remaining
independent variable: amount of time you listen
page 128
#16
a. 495 miles
b. 12.5 h
page 119
#44
a. nonlinear; As t increases by 2, d increases by different amounts. The rate of change is not constant.
b. yes; Using d=50t, Car A has traveled a shorter distance for each of the times given in the chart for Car B.
page 8
#20
x+60+115+85=360
x=100
page 85
#18
-5<n<4
page 125
#10
5; 3; -2
page 141
#8
negative; -4/5
page 165
#9
13; 4; -11
page 26
#14
y = -2
page 91
#10
1<n<3.5
page 109
#18
a. y = dependent variable
x = independent variable
b. domain: 0<x<20
range: 2.8<y<72.8
page 142
#38
a. domain: x>0; range: c>70
b. slope: 1/2. So, the mileage rate is $0.50 per mile.
c-intercept: 70. So, the basic rental fee is $70.
page 165
#11
x = -4
page 16
#28
x = 125
120 degrees 135 degrees
100 degrees 120 degrees
120 degrees 125 degrees
page 96
#22
-2<z<6
page 133
#16
(-9,0)
(0,3)
page 141
#12
m = -7
page 166
#24
m = -2/3
(3,0)
(0,3)