3. a zoo keeper thinks there is a problem with the rat population at the zoo. he starts keeping track of the animals in the tunnels. seven days into his monitoring he counts 120 rats, 13 days in he counts 108 a. write an equation that represents this situation (define your variables). b. if nothing changes, how many days will go by before the rats are gone?

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

5+2x=a

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the answer to your question is c.)   volcanoes built the mountains and earthquakes tore them down.

step-by-step explanation: