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State the range of the function f(n) = 2n + 1 if the domain is -2

Pls! does anybody know a shortcut for answering these types of questions in the future?

What is the x-intercept and y-intercept of the equation 2x+1. 2o

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?