What is the answer for this problem

Find the missing factor. 7s2 + 25s + 12 = (s + 3)( ).

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?