Math 120 Exam Solutions - Prof. Brick, Exams of Calculus

The solutions to math 120 exams 1, 2, 3, and the final exam conducted by prof. Brick during the fall 1998 semester. The exams cover various topics in calculus, including differentiation, integration, optimization, and applications.

Typology: Exams

2012/2013

Uploaded on 03/31/2013

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Fall 98 Math 120 Exam 1 Prof. Brick
Do the problems in order in your bluebook. Show your work.
1. Use a tangent line of xto approximate 9.1. Draw a graph that illustrates things.
2. Find the equation of the line tangent to f(x)=(x2+2)
2at x=1.
3. Suppose y>0 for x<5 and y<0 for 5 <x. What sort of point does the graph of y
have at x= 5 ? Explain.
4. For what xis the tangent line of y=x3
3xhorizontal ? Don’t use your grapher here.
5. A ball is thrown up from a window. Its height is s(t)=96+16t16t2feet tseconds
later. At what time and at what velocity does it hit the ground ?
6. Find the derivative of y=7
x2πx7+7π3+7
x7+1
7. For what xis y=x3
x2concave up ? Find all such x. Don’t use your grapher here.
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Do the problems in order in your bluebook. Show your work.

  1. Use a tangent line of √x to approximate √ 9 .1. Draw a graph that illustrates things.
  2. Find the equation of the line tangent to f (x) = (x^2 + 2)^2 at x = 1.
  3. Suppose have at x = 5? Explain. y′^ > 0 for x < 5 and y′^ < 0 for 5 < x. What sort of point does the graph of y
  4. For what x is the tangent line of y = x^3 − 3 x horizontal? Don’t use your grapher here.
  5. A ball is thrown up from a window. Its height islater. At what time and at what velocity does it hit the ground? s(t) = 96 + 16t − 16 t^2 feet t seconds
  6. Find the derivative of y = √^7 x^2 − πx^7 + 7π^3 + (^) x (^7 7) + 1
  7. For what x is y = x^3 − x^2 concave up? Find all such x. Don’t use your grapher here.

Do the problems in order in your bluebook. Use algebraic techniques.

  1. Design a rectangular garden placed up against a wall that uses 200 feet of fencing andencloses as much area as possible.
  2. Find the absolute min/max’s of y = 19 x + (1/x) over [2, 5]
  3. A bookstore sells 8000 copies of “The Joy of Calculus” each year. The order fee is $40.The carrying costs are $2 per book per year. How often should orders be placed?
  4. Use the second derivative test to classify the the local min/max’s of y = 13 x^3 − 2 x^2 − 5 x.
  5. You have a sample of the radioactive element Calculusium. At noon you have 63 grams.At 2:45 pm you have 40 grams. Find its half-life.
  6. You wish to sell Calculus T-shirts to raise money for a math party. A market surveyindicates that if you charge $20 a shirt, you will sell 60 each week, while each dollar increase will result in four fewer sales. Find the price that maximizes revenue.
  7. Find where f (x) = ln(x^2 + 1) is concave up or down and find its inflection points.
  8. Find the first derivative of g(x) =^ ( 4 x^6 + ex^2 + √x^ ) · ( 5 x^2 + π^2 − eπ^ )

Fall 98 Math 120 Final Exam Prof. Brick

Do the problems in order in your bluebook. Use algebraic techniques.

  1. A ball is thrown up from a window. Its height afterAt what velocity does it hit the ground? t seconds is s(t) = 96 + 16t − 16 t^2.
  2. Find the tangent line to h(x) = (^) xx 2 + 1+ 3 at x = 1
  3. Use the second derivative test to classify the the local min/max’s of y = x^3 − 6 x^2.
  4. The cost of producing x units is C(x) = 1000 + xe.^3 x. Find the marginal cost. 5.exponential model, predict the population in the year 2000. The population of Calculusville was 120, 000 in 1950 and 200, 000 in 1980. Using an
  5. How long before money at 7.5% annual interest compounded monthly doubles?
  6. Design a rectangular garden placed up against a long wall that uses 400 feet of fencingand encloses as much area as possible.
  7. You wish to sell espresso during lunchtime. A market survey indicates that if you charge$1 a cup, you will sell 44 cups an hour while each dime increase will result in four fewer sales. Find the price that maximizes revenue.
  8. Find a function y = f (x) for which y′^ = 3x^2 − 2 x and y(1) = 0.
  9. Find the area of the region bounded by y = x^2 and y = x.