Randolph College
Department of Mathematics and Computer Science

 

Homework # 5 - Math 1150


The problems on this homework must be done alone.  The honor code is in effect.

You may submit the solutions twice, if you wish.

 First Name:  Last Name:

 

1.  Compute the indefinite integral   \( \int \frac{1}{x+9}\) dx

a.  (1/3) arctan(x/3) + c

b.  x - 9 ln(x+9) + c

c.  ln(x+9) + c

d.  ln(x2 +9) + c

e.  (1/2)ln(x2 +9) + c

 

2.  Compute the indefinite integral  \( \int \frac{1}{x^2 +9}\) dx.

a.  (1/3) arctan(x/3) + c

b.  x - 9 ln(x+9) + c

c.  ln(x+9) + c

d.  ln(x2 +9) + c

e.  (1/2)ln(x2 +9) + c

 

3.  Compute the indefinite integral  \( \int \frac{x}{x^2 + 9} \) dx.

a.  (1/3) arctan(x/3) + c

b.  x - 9 ln(x+9) + c

c.  ln(x+9) + c

d.  ln(x2 +9) + c

e.  (1/2)ln(x2 +9) + c

 

4.  Compute the indefinite integral  \( \int \frac{x}{x+9} \)dx.

a.  (1/3) arctan(x/3) + c

b.  x - 9 ln(x+9) + c

c.  ln(x+9) + c

d.  ln(x2 +9) + c

e.  (1/2)ln(x2 +9) + c

 

5. Find the area enclosed between the curves \( y = 2^x\) and \( y = \frac{3}{2}x + 1\).

a.  \(\frac{2}{3} \)

b.  \( 5- \frac{3}{\ln 2}\)

c.  \( 1\)

d.  \( 2\)

e.  \( 4 - 5 \ln 2\)

 

6. Find the volume enclosed when you revolve the curve \( y = e^{\frac{x}{2}} \) around the \(x\)-axis between \(x = 0\) and \(x = 4\).

a.  \(\pi e^8 \)

b.  \(\pi (e^2 - 1)\)

c.  \(\pi (e^4 - 1)\)

d.  \(\pi e^4\)

e.  \( \pi\)