Can the product of two integers with different signs can be positive or negative

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Elena is paid a constant rate for each hour she works. the table shows the amounts of money that elena earned for various amounts of time that she worked.

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?