Name                                     MATH 154 PRACTICE FINAL Please work out each of the given problems.  Credit will be based on the steps that you show towards the final answer.  Do all of your work and show your solutions on your own sheet of paper.  Show your work. Problem 1   Solve Problem 2  A square floppy disk is of length 4.8 in across the diagonal.  Determine the length of the side of the disk. Problem 3   Determine (f o g)(x)    if    f(x)  =  2x - 1     and    g(x)  x2+ 2x Problem 4   Graph the quadratic function.  Label the intercepts and the vertex.  Then put the parabola in standard form and explain in complete sentences how the parabola y = x2  has “shifted”.         y  =  x2 - 2x - 3 Problem 5  Sketch the graph of the following A.           4x + 9y  =  36 Solution B.                   y2          x2                          -              =  1                                25           4 Solution C.      y  =  |x - 4| Solution D.      y  =  3x + 2 Solution E.       y  =  log2(-x) Solution F.        x2 + y2 - 4y  =  12 Solution   Problem 6 Determine whether the given function is 1-1.  If it is find its inverse A.     f(x)  =  (x - 2)2 Solution B.     f(x)  =  4 - 3x Problem 7  Solve A.     2x  =  3x-1    Solution B.      log(37x - 1)  =  log(2x + 5) + 1 Problem 8    Expand the following logarithm.  Simplify where possible.  Assume all variables are such that all expressions are defined.            Problem 9  Solve the system.  then describe in words what is happening geometrically.         x2 + y2  =  25         2x + y  =  5 Problem 10  Write the following series in summation notation.           3         4           5           6                 12                 +         +           +          + ... +                           4         9          16         25               121 Problem 11   Find the indicated unknown for the arithmetic sequence.         S15  =  -300,    a15  =  -8,    a23  =  ? Problem 12  Fifteen years ago 10,000 tons of trash were put into the landfall.  Each year, because of growth, the trash used by the community is increased 10% over the previous year.  How much total trash is in the landfill today?  (use a geometric series) Problem 13  Answer the following true or false and explain your answer. A.      The only conic that is the graph of a function is the parabola  y  =  ax2 + bx + c   Solution B.          Solution C.       log4(1 - x)  is undefined at x = -3.