1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C = __6,000__ (all supposed to be underlined)

Question

300-3x

a. What is the cost to remove 75% of the pollutant?

b. What is the cost to remove 90% of the pollutant?

c. What is the cost to remove 99% of the pollutant?

d. For what value is this equation undefined?

e. Do the answers to sections a. through d. match your expectations? Explain why or why not.

Answer 1

Type divisions this way ...
C = 6000/(300-x)

a) replace x with 75
C = 6000/(300-3(75))
= 6000/75 = 80

b) you try it, should get 200
c) should be really high

d) what happens when x = 100 ?

Answer 2

For A...I have 80million
B...200million
C...58 million

Answer 3

c)
C = 6000/(300 - 3(99))
= 6000/3
= 2000 million

Answer 4

ok i did it like this:
6000/(300-3*99)
oh!!! never mind got it now..thank you!!!!