The cost of cleaning up pollution in a stream is given by

where c is the cost in dollars to clean p percent of the stream. p must be greater than or equal to zero and p must be less than what number? why?

p must be less than 100

Step-by-step explanation:

Let

c ----> the cost in dollars to clean the stream

p ----> percent of the stream

we have

Remember that the cost cannot be a negative number

and

the denominator cannot be a zero

so

Solve for p

Multiply by -1

Adds 100 both sides

therefore

p must be less than 100

50-38=12

step-by-step explanation: