6.12.3 Can you answer these questions?

6.12.3.1 Cross reference a figure from another frame

https://tex.stackexchange.com/landing/r/digest?cta=question&id=536947

I have a figure in one frame and couple of frames later, I need to reference the figure. When I call \ref, it just prints ?? in the beamer presentation. Here's an MWE: 
\documentclass[12pt]{beamer} 
... 
[beamer] [cross-referencing] [citing]
 

asked by learner https://tex.stackexchange.com/landing/r/digest?cta=user&id=199062 1 vote

6.12.3.2 Tag number at wrong place in an align environment

https://tex.stackexchange.com/landing/r/digest?cta=question&id=536670

I'm having a problem in numbering some equations in this MWE code: 
\documentclass[11pt,letterpaper,twoside]{book} 
\usepackage[T1]{fontenc} 
\usepackage{lmodern} 
... 
[math-mode] [align] [amsmath] [tags] [gather]
 

asked by Cham https://tex.stackexchange.com/landing/r/digest?cta=user&id=139556 1 vote

6.12.3.3 ! LaTeX Error: File `chickenize.tex' not found

https://tex.stackexchange.com/landing/r/digest?cta=question&id=536241

I don't know what is wrong. I'm fairly sure I installed the package. Can someone who has installed the chickenize package test this? 
\documentclass{beamer} 
\mode<presentation> 
{ 
... 
[chickenize]
 

asked by Hao S https://tex.stackexchange.com/landing/r/digest?cta=user&id=63578 1 vote