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i need the answer to this

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?