Answer:
The pecan-covered cake was super moist.
Step-by-step explanation:
Generally, a hyhen is used to combine two or more words when they come before a noun they modify and act as a single idea. In this case, pecan covered is describing the cake. Note, how I did not hyphenate pecan covered in these sentences because it doesn't come directly before the noun. Some words are always hyphenated, but none of the words here.