When the brush tool is selected, how can you change its opacity to 75% by using the keyboard instead of the slider?

Which one is NOT a category under Preferences?

Under which menu is the Displace option located?

Which one is the use for alpha channels?

Where can you find the option to reverse the layer order?

You open a document and some of the filters are disabled in the Filter menu. Which could be a reason for this?

Shortcut for Auto Tone?

Which one is NOT included in the purge menu?

Which type of files can be used as a displacement map on the displace filter?

Which file format supports 16-bit color, 8-bit color, indexed color, grayscale, and alpha channels, but not CMYK?

Which control in camera raw lets you quickly recover detail in the shadows without unduly affecting highlights or causing posterization ?