Please answer all parts of this equation,The function models the amount of money ,S ,in billions of dollars, the united states goverment spent on science and technology for the time period 1999-2009, where t is the number of years since 1999
1,write the constraints for the variable t using set builder notation...

2,determine the value of s(7)

3,interpret the value of s(7) in context interpret meaning explain what it is (ex:science only has 50 dollars because someone stole fom them)

name the key feature that is found when solving s(t)=0 then,label the key feature on the graph of s(t)=1.084x+17.392

4. determine if the value for s(t)=0 is reasonable explain why or why not

5.PLEASE MAKE YOUR ANSWER EASY TO READ AND THE ANSWERS ARE POSTED CLEARLY,