Math 181

Test 1 review questions

The best way to prepare for this test is to practice on as many problems as possible.  If you haven’t done all of the assigned homework from the book, or all of the worksheets, do so now!  If you have, make sure you look back over them, so that you remember what you need to do to solve the different types of problems on the test.  You can also use the gateway modules for extra practice on the algebra and interpreting limits.

Finally, here are several more questions, all of which are similar to questions I have asked in the past.

1.  If :   Evaluate f(2), f(a), f(2+a), and .

2. The population of Rockville was 47,000 in 2000, and grew to 61,000 in 2010.

a.  Assuming the population grew linearly, find a formula for p, the population of the city as a function of t, the number of years since 2000.

b.  Interpret the slope of your answer to part (a) in practical terms (ie – your answer should include units and a description of what it tells you in the context of the problem)

c.  Now assume that the population of Rockville grew exponentially.  Again, find a formula for p, the population of the city as a function of t, the number of years since 2000.

3.  If  , find each of the following:

4.  Express as a composition of functions

5.  For the function f(x) graphed to the right:

a.  What is the domain?  The range?

b.  Is f(x) invertible?  Why or why not?

c.  Graph f(2x), f(x-2), and f(x)+1

6.  Use your calculator to find all solutions to .  Round your answers to 3 decimal places.

7.  If f(x) = , find a formula for f-1(x)

8.    For the function shown in the graph to the right:

a.  What is the value of f(2)?  The value of f-1(2)?

b.  Sketch the inverse of the function on the same set of axes.

9.  Zoom in on the graph of  near the point (2, 8) until it looks like a straight line.

Then use the trace feature to find the coordinates of another point on the curve, and find the slope of the line connecting those 2 points.  Finally, find an equation for that line.

10.  Let P be the point (2, 8).  Find the slope of the secant line PQ, where Q is the point for the following values of x (Give answers to 3 decimal places)

a) 3                     b) 2.1                        c) 2.001

d)  Using parts (a)-(c) above, and additional points if necessary, approximate the slope of the tangent line to  at the point x=2.

e)  What is the connection between this problem and #9?

11.  Use the definition of the derivative (either form of the formula) to find the derivative of

at (2,-2).  Then use this to find the tangent line to this function at that point

12. f(x) is the function graphed to the right:

a.  Does  exist?  If so, what is it?

b.  Does  exist?  If so, what is it?

c.  Does  exist?  If so, what is it?

d.  Does f(-1) exist?  If so, what is it?

e.  Is f continuous at x= -1?  Why or why not?

f.  Is f continuous at x= 1?  Why or why not?

13.  Evaluate the following limits.  Use numeric and graphic means, and where possible also use algebra to confirm the answer:

14.  If for all x, , what is ?

15.  Find numbers a and b such that  is continuous everywhere.

16.  Carefully explain why there must be a number x between 0 and 1 such that

17.  The height of a ball, t seconds after it is thrown, is given by  .

a.  What is the average speed of the ball over the first second after it is thrown?

b.  What is the instantaneous speed of the ball one second after it is thrown?

18.  The graph shows f, f’, and f’’.  Which curve is which?  How do you know?