explain example 4

[Rani]

http://cphs.dadeschools.net/departments/mathematics/ebooks/alg1mcd/Source/LA104GBD.pdf
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can someone explain me example 4 from this link

 

[Rani]

example

you are an intern example

 

[Deleted member 4993]

http://cphs.dadeschools.net/departments/mathematics/ebooks/alg1mcd/Source/LA104GBD.pdf
'

can someone explain me example 4 from this link

What part of that example is incomprehensible for you?

 

[Rani]

stage 3

stage 3. how did the river height decreased from 54 to 24. The equation h= -5/8t + 99