Write the necessary preprocessor directive to enable the use of functions like sqrt and sin.

answer: a

a is the answer

answer:

design model: consists of design geometry; can be 2d or 3d; typically has a black background.

design files: drawing created with microsoft expression design, a drawing and design program for windows; may contain both vector and raster graphics; can also include multiple layers and various image effects.

elements: an element is a single part of a larger group.

i'd try logging out, closing the browser, and unplugging the computer for a few seconds and then start everything back up again and log in. if it still doesn't work, maybe try clicking slower. or close a couple tabs or other windows you may have up

I don't know much ab computers but I hope this helped