Help please why isnt this working oh nvm

What is the inverse of the function f(x) = 2x + 1?

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at link to the chart is here

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.