41.

1. $f(x)={\displaystyle \frac{1}{33.81}}x;$ domain: $[0,\infty );$ range: $[0,\infty )$

2. 0.0887; it means that 3 $\text{oz}=0.0887\text{liter}.$

3. 0.3549

43.

1. No d-intercept because $d\ge 0;$ y-intercept: 1. It means that the ­pressure at sea level $(d=0)$ is 1 atm.

2. $P(0)=1,P(10)\approx 1.3,P(33)=2,P(100)\approx 4.03$

3. 132 ft

45.

1. $C=50x+6000$

2. The y-intercept is the fixed overhead cost.

   

3. 110

47.

1. $R=900-30x$

2. $720

3. Ten days after the first of the month

49. 70

51.

1. $y={\displaystyle \frac{2}{27}}(x-150)+30$

2. 45

3. $690\text{ mg }/{\text{m}}^3$

53.

1. 

2. 1. $480

   2. $800

   3. $2600

3. 1. $15,000

   2. $26,667

   3. $45,000