Thursday

July 31, 2014

July 31, 2014

Posted by **Devon** on Tuesday, July 13, 2010 at 3:43pm.

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

b. You can find the average cost per animal by dividing total costs by number of animals. Write the expression that gives the average cost per animal.

c. Find the average cost per animal for 10 animals, 100 animals, and 1,000 animals.

d. As the number of animals tested increases, what happens to the average cost to test the animals? Would the average cost ever fall below $3.00? If so, identify a value that supports your answer. If not, explain how you know.

e. How many animals should be tested for the average cost to be $5.00 per animal?

- Algebra -
**Henry**, Tuesday, July 13, 2010 at 7:31pma. C = 2500 + 3X.

b. Avg = ( 2500 + 3X ) / X

c. Avg = ( 2500 + 3*10 ) / 10 = 253

Avg = ( 2500 + 3*100 ) / 100 = 28

Avg = ( 2500 + 3*1000 ) /1000 = 5.5

d. Decreases. No. Rearranginging

equation: Avg = 2500 / x + 3X/X

As X increases, the first term

approaches 0; but 2nd term re-

mains constant at 3. Therefore

the min. is 3.

e. Avg = ( 2500 + 3X ) / X = 5.00

Solve for X by multiplying both

sides by X: 2500 + 3X = 5X,

2X = 2500, X = 1250.

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