Please help!! I need the answer asap

Atriangle has side lengths of 15 inches and 30 inches. it also has angles that measure 45º and 20º. which of the following identifies the possible third angle of the triangle? a. 15 in., 65º b. 45 in., 65º c. 17 in., 115º d. 14 in., 115º

What is the number 321,000,000 in scientific notation? also what is the number? ?

Ineed to know the answer to this algebra question.