Creating an interactive bar graph that corresponds to sliders and an equation

Hello, I have 3 questions related to my topic. Help on any of them would be valuable, thank you!

-Is it possible to use 3 sliders in r shiny to affect 1 bar that increases or decreases in length depending on if you increase or decrease the values of the sliders?

-If it is not possible to have 1 bar, if I were to implement a normal bar graph, could multiple bars be affected by multiple sliders? Can sliders work with bar graphs at all or only with histograms?

-The sliders would all be different variables that affect 1 equation whose result would determine the length of the bar. When the user would slide the sliders, it would change the value of the variables which would change the length of the bar in real time. Is this possible?