What is the answer to solve -2=4r+s for s

Which shows the pre image of triangle xyz

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?

What are the domain and range of the function f(x)=2^x+1