Question Number

Problem

Solution/Answers

(Your work in this column only)

Feedback/Scoring

(This column is for my use)

To earn full
credit, all work must be shown. Answers only will receive 1 point.

1

The cost, in millions, to
remove x% of pollution in a pond is modeled by the equation:

12C=(NNN) NNN-NNNN3x' type="#_x0000_t75">

.

What is the cost to remove 65% of the pollution?

Hint: Plug in and calculate, do not convert to a
decimal.

5 points

2

For the equation in
question 1, what value of x would make the equation undefined? Round to the
nearest tenth place.

Hint: Think about what makes an equation undefined.
Then calculate what value would make this equation undefined.

8 points

3

Scientists want to set up
and test animals in the area for West Nile. The costs to test are $4,200 for
setup plus $1.25 to administer each test.

Write an expression that gives the total cost
to test x animals.

Hint: Remember that expressions and equations are
different.

4 points

4

We can find the average
cost per animal by dividing total costs by number of animals.

Write an expression that helps solve the average
cost per animal.

Hint: You need to use the answer from question 3 to
get this answer right.

4 points

5

What is the average cost to
test 25 animals?

Hint: Plug in to your answer from question 5.

5 points

6

What is the average cost to
test 250 animals?

Hint: Plug in to your answer from question 5.

5 points

7

What is the average cost to
test 1,000 animals?

5 points

8

As the number of animals
tested increases, what happens to average cost to test the animals?

Why does this happen?

5 points

9

How many animals should be
tested for the average cost to be $4.00 per animal?

(Remember we cannot have
partial animals)

For full credit you must
show the correct mathematical steps, not plug and guess.

9 points

Use of the Equation Editor (5 points)

• 
  Equation Editor
  must be used for every problem in order to receive the points.

• 
  Exponents must
  be formatted as a superscript in order to get these points as well.

Spelling, Grammar and Formatting (5
points)

• 
  Be sure to
  check your work for spelling and grammar mistakes.

• 
  If the problem
  is dealing with money, be sure to format your answer with a dollar sign and 2
  decimal spaces.

• 
  If the problem
  involves a large number, use commas where appropriate.

• 
  File must be
  saved using the file name listed above.

Late Point Deduction

1 day -12 points

2 days -24 points

Total Points Earned out of 60 possible
points

Question Number

Problem

Solution/Answers

(Your work in this column only)

Feedback/Scoring

(This column is for my use)

To earn full
credit, all work must be shown. Answers only will receive 1 point.

1

The cost, in millions, to
remove x% of pollution in a pond is modeled by the equation:

12C=(NNN) NNN-NNNN3x' type="#_x0000_t75">

.

What is the cost to remove 65% of the pollution?

Hint: Plug in and calculate, do not convert to a
decimal.

5 points

2

For the equation in
question 1, what value of x would make the equation undefined? Round to the
nearest tenth place.

Hint: Think about what makes an equation undefined.
Then calculate what value would make this equation undefined.

8 points

3

Scientists want to set up
and test animals in the area for West Nile. The costs to test are $4,200 for
setup plus $1.25 to administer each test.

Write an expression that gives the total cost
to test x animals.

Hint: Remember that expressions and equations are
different.

4 points

4

We can find the average
cost per animal by dividing total costs by number of animals.

Write an expression that helps solve the average
cost per animal.

Hint: You need to use the answer from question 3 to
get this answer right.

4 points

5

What is the average cost to
test 25 animals?

Hint: Plug in to your answer from question 5.

5 points

6

What is the average cost to
test 250 animals?

Hint: Plug in to your answer from question 5.

5 points

7

What is the average cost to
test 1,000 animals?

5 points

8

As the number of animals
tested increases, what happens to average cost to test the animals?

Why does this happen?

5 points

9

How many animals should be
tested for the average cost to be $4.00 per animal?

(Remember we cannot have
partial animals)

For full credit you must
show the correct mathematical steps, not plug and guess.

9 points

Use of the Equation Editor (5 points)

• 
  Equation Editor
  must be used for every problem in order to receive the points.

Spelling, Grammar and Formatting (5
points)

• 
  Be sure to
  check your work for spelling and grammar mistakes.

• 
  If the problem
  is dealing with money, be sure to format your answer with a dollar sign and 2
  decimal spaces.

• 
  If the problem
  involves a large number, use commas where appropriate.

• 
  File must be
  saved using the file name listed above.

Late Point Deduction

1 day -12 points

2 days -24 points

Total Points Earned out of 60 possible
points