College Algebra, 4th Edition

Applying the Concepts

1. 85. Yes, because there is only one high temperature every day

2. 87. No, because Nevada and North Carolina both start with N

3. 89. $A(x)=x^2;A(4)=16;A(4)$ represents the area of a square tile with side of length 4.

4. 91. It is a function. $S(x)=6x^2;S(3)=54$

5. 93.

   1. [0, 8]

   2. $h(2)=192,h(4)=256,h(6)=192$

   3. 8 sec

   4. 

6. 95. $P=28x-x^2$

7. 97. $S=2x^2+{\displaystyle \frac{256}{x}}$

8. 99. $A={\displaystyle \frac{x^2}{4\pi }}+{\displaystyle \frac{1}{16}}{(20-x)}^2$

9. 101. $C=2x^2+{\displaystyle \frac{6912}{x}}$

10. 103. $d={[{(x-2)}^2+{(x^3-3x+5)}^2]}^{1/2}$

11. 105.

    1. $p(5)=1150;$ if 5000 TVs can be sold, the price per TV is $1150. $p(15)=900;$ if 15,000 TVs can be sold, the price per TV is $900. $p(30)=525;$ if 30,000 TVs can be sold, the price per TV is $525

    3. $p(25)=650;$ if the TVs are priced ...